diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000000000000000000000000000000000000..847abcf02474905899f4557ca3ce06b146156602
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,28 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build-ubuntu:
+    strategy:
+      matrix:
+        platform: [ubuntu-latest, ubuntu-16.04]
+    runs-on: ${{ matrix.platform }}
+    steps:
+    - uses: actions/checkout@v1
+    - name: make
+      run: make
+    - name: test
+      run: |
+        sudo apt-get install tcl8.5
+        make test
+
+  build-macos-latest:
+    strategy:
+      matrix:
+        platform: [macos-latest, macOS-10.14]
+    runs-on: ${{ matrix.platform }}
+    steps:
+    - uses: actions/checkout@v1
+    - name: make
+      run: make
diff --git a/runtest-moduleapi b/runtest-moduleapi
index 444204919a1adac922ebde0b9dfa224eebb3e24f..9301002c91d8fdca6f54d7418bc4a2a9237821b4 100755
--- a/runtest-moduleapi
+++ b/runtest-moduleapi
@@ -13,4 +13,12 @@ then
 fi
 
 make -C tests/modules && \
-$TCLSH tests/test_helper.tcl --single unit/moduleapi/commandfilter --single unit/moduleapi/fork --single unit/moduleapi/testrdb --single unit/moduleapi/infotest --single unit/moduleapi/propagate --single unit/moduleapi/hooks "${@}"
+$TCLSH tests/test_helper.tcl \
+--single unit/moduleapi/commandfilter \
+--single unit/moduleapi/fork \
+--single unit/moduleapi/testrdb \
+--single unit/moduleapi/infotest \
+--single unit/moduleapi/propagate \
+--single unit/moduleapi/hooks \
+--single unit/moduleapi/misc \
+"${@}"
diff --git a/src/module.c b/src/module.c
index a4384163a242b44b540324701a92d664c7a7e475..f298ec7608681e5b4b7591ab8bb167591c3f7bf9 100644
--- a/src/module.c
+++ b/src/module.c
@@ -327,6 +327,13 @@ static struct RedisModuleForkInfo {
 #define REDISMODULE_ARGV_NO_AOF (1<<1)
 #define REDISMODULE_ARGV_NO_REPLICAS (1<<2)
 
+/* Determine whether Redis should signalModifiedKey implicitly.
+ * In case 'ctx' has no 'module' member (and therefore no module->options),
+ * we assume default behavior, that is, Redis signals.
+ * (see RM_GetThreadSafeContext) */
+#define SHOULD_SIGNAL_MODIFIED_KEYS(ctx) \
+    ctx->module? !(ctx->module->options & REDISMODULE_OPTION_NO_IMPLICIT_SIGNAL_MODIFIED) : 1
+
 /* Server events hooks data structures and defines: this modules API
  * allow modules to subscribe to certain events in Redis, such as
  * the start and end of an RDB or AOF save, the change of role in replication,
@@ -827,6 +834,7 @@ void RM_SetModuleAttribs(RedisModuleCtx *ctx, const char *name, int ver, int api
     module->filters = listCreate();
     module->in_call = 0;
     module->in_hook = 0;
+    module->options = 0;
     ctx->module = module;
 }
 
@@ -857,6 +865,12 @@ void RM_SetModuleOptions(RedisModuleCtx *ctx, int options) {
     ctx->module->options = options;
 }
 
+/* Signals that the key is modified from user's perspective (i.e. invalidate WATCH). */
+int RM_SignalModifiedKey(RedisModuleCtx *ctx, RedisModuleString *keyname) {
+    signalModifiedKey(ctx->client->db,keyname);
+    return REDISMODULE_OK;
+}
+
 /* --------------------------------------------------------------------------
  * Automatic memory management for modules
  * -------------------------------------------------------------------------- */
@@ -1848,7 +1862,9 @@ void *RM_OpenKey(RedisModuleCtx *ctx, robj *keyname, int mode) {
 /* Close a key handle. */
 void RM_CloseKey(RedisModuleKey *key) {
     if (key == NULL) return;
-    if (key->mode & REDISMODULE_WRITE) signalModifiedKey(key->db,key->key);
+    int signal = SHOULD_SIGNAL_MODIFIED_KEYS(key->ctx);
+    if ((key->mode & REDISMODULE_WRITE) && signal)
+        signalModifiedKey(key->db,key->key);
     /* TODO: if (key->iter) RM_KeyIteratorStop(kp); */
     RM_ZsetRangeStop(key);
     decrRefCount(key->key);
@@ -3072,7 +3088,10 @@ RedisModuleCallReply *RM_Call(RedisModuleCtx *ctx, const char *cmdname, const ch
 
     /* We handle the above format error only when the client is setup so that
      * we can free it normally. */
-    if (argv == NULL) goto cleanup;
+    if (argv == NULL) {
+        errno = EINVAL;
+        goto cleanup;
+    }
 
     /* Call command filters */
     moduleCallCommandFilters(c);
@@ -3864,6 +3883,11 @@ const RedisModuleString *RM_GetKeyNameFromIO(RedisModuleIO *io) {
     return io->key;
 }
 
+/* Returns a RedisModuleString with the name of the key from RedisModuleKey */
+const RedisModuleString *RM_GetKeyNameFromModuleKey(RedisModuleKey *key) {
+    return key ? key->key : NULL;
+}
+
 /* --------------------------------------------------------------------------
  * Logging
  * -------------------------------------------------------------------------- */
@@ -4537,6 +4561,20 @@ int RM_SubscribeToKeyspaceEvents(RedisModuleCtx *ctx, int types, RedisModuleNoti
     return REDISMODULE_OK;
 }
 
+/* Get the configured bitmap of notify-keyspace-events (Could be used
+ * for additional filtering in RedisModuleNotificationFunc) */
+int RM_GetNotifyKeyspaceEvents() {
+    return server.notify_keyspace_events;
+}
+
+/* Expose notifyKeyspaceEvent to modules */
+int RM_NotifyKeyspaceEvent(RedisModuleCtx *ctx, int type, const char *event, RedisModuleString *key) {
+    if (!ctx || !ctx->client)
+        return REDISMODULE_ERR;
+    notifyKeyspaceEvent(type, (char *)event, key, ctx->client->db->id);
+    return REDISMODULE_OK;
+}
+
 /* Dispatcher for keyspace notifications to module subscriber functions.
  * This gets called  only if at least one module requested to be notified on
  * keyspace notifications */
@@ -6618,6 +6656,7 @@ void moduleRegisterCoreAPI(void) {
     REGISTER_API(ModuleTypeGetValue);
     REGISTER_API(IsIOError);
     REGISTER_API(SetModuleOptions);
+    REGISTER_API(SignalModifiedKey);
     REGISTER_API(SaveUnsigned);
     REGISTER_API(LoadUnsigned);
     REGISTER_API(SaveSigned);
@@ -6640,6 +6679,7 @@ void moduleRegisterCoreAPI(void) {
     REGISTER_API(StringCompare);
     REGISTER_API(GetContextFromIO);
     REGISTER_API(GetKeyNameFromIO);
+    REGISTER_API(GetKeyNameFromModuleKey);
     REGISTER_API(BlockClient);
     REGISTER_API(UnblockClient);
     REGISTER_API(IsBlockedReplyRequest);
@@ -6654,6 +6694,8 @@ void moduleRegisterCoreAPI(void) {
     REGISTER_API(DigestAddStringBuffer);
     REGISTER_API(DigestAddLongLong);
     REGISTER_API(DigestEndSequence);
+    REGISTER_API(NotifyKeyspaceEvent);
+    REGISTER_API(GetNotifyKeyspaceEvents);
     REGISTER_API(SubscribeToKeyspaceEvents);
     REGISTER_API(RegisterClusterMessageReceiver);
     REGISTER_API(SendClusterMessage);
diff --git a/src/redismodule.h b/src/redismodule.h
index 1b284770be97c1a6524a42d481e4b533a9be15c8..ea0d6a139eaa038596a7893df048bfddd7052376 100644
--- a/src/redismodule.h
+++ b/src/redismodule.h
@@ -106,6 +106,11 @@
 /* There is currently some background process active. */
 #define REDISMODULE_CTX_FLAGS_ACTIVE_CHILD (1<<18)
 
+/* Keyspace changes notification classes. Every class is associated with a
+ * character for configuration purposes.
+ * NOTE: These have to be in sync with NOTIFY_* in server.h */
+#define REDISMODULE_NOTIFY_KEYSPACE (1<<0)    /* K */
+#define REDISMODULE_NOTIFY_KEYEVENT (1<<1)    /* E */
 #define REDISMODULE_NOTIFY_GENERIC (1<<2)     /* g */
 #define REDISMODULE_NOTIFY_STRING (1<<3)      /* $ */
 #define REDISMODULE_NOTIFY_LIST (1<<4)        /* l */
@@ -161,6 +166,10 @@ typedef uint64_t RedisModuleTimerID;
 
 /* Declare that the module can handle errors with RedisModule_SetModuleOptions. */
 #define REDISMODULE_OPTIONS_HANDLE_IO_ERRORS    (1<<0)
+/* When set, Redis will not call RedisModule_SignalModifiedKey(), implicitly in
+ * RedisModule_CloseKey, and the module needs to do that when manually when keys
+ * are modified from the user's sperspective, to invalidate WATCH. */
+#define REDISMODULE_OPTION_NO_IMPLICIT_SIGNAL_MODIFIED (1<<1)
 
 /* Server events definitions. */
 #define REDISMODULE_EVENT_REPLICATION_ROLE_CHANGED 0
@@ -181,7 +190,7 @@ typedef struct RedisModuleEvent {
 struct RedisModuleCtx;
 typedef void (*RedisModuleEventCallback)(struct RedisModuleCtx *ctx, RedisModuleEvent eid, uint64_t subevent, void *data);
 
-static RedisModuleEvent
+static const RedisModuleEvent
     RedisModuleEvent_ReplicationRoleChanged = {
         REDISMODULE_EVENT_REPLICATION_ROLE_CHANGED,
         1
@@ -434,6 +443,7 @@ RedisModuleType *REDISMODULE_API_FUNC(RedisModule_ModuleTypeGetType)(RedisModule
 void *REDISMODULE_API_FUNC(RedisModule_ModuleTypeGetValue)(RedisModuleKey *key);
 int REDISMODULE_API_FUNC(RedisModule_IsIOError)(RedisModuleIO *io);
 void REDISMODULE_API_FUNC(RedisModule_SetModuleOptions)(RedisModuleCtx *ctx, int options);
+int REDISMODULE_API_FUNC(RedisModule_SignalModifiedKey)(RedisModuleCtx *ctx, RedisModuleString *keyname);
 void REDISMODULE_API_FUNC(RedisModule_SaveUnsigned)(RedisModuleIO *io, uint64_t value);
 uint64_t REDISMODULE_API_FUNC(RedisModule_LoadUnsigned)(RedisModuleIO *io);
 void REDISMODULE_API_FUNC(RedisModule_SaveSigned)(RedisModuleIO *io, int64_t value);
@@ -456,6 +466,7 @@ void REDISMODULE_API_FUNC(RedisModule_RetainString)(RedisModuleCtx *ctx, RedisMo
 int REDISMODULE_API_FUNC(RedisModule_StringCompare)(RedisModuleString *a, RedisModuleString *b);
 RedisModuleCtx *REDISMODULE_API_FUNC(RedisModule_GetContextFromIO)(RedisModuleIO *io);
 const RedisModuleString *REDISMODULE_API_FUNC(RedisModule_GetKeyNameFromIO)(RedisModuleIO *io);
+const RedisModuleString *REDISMODULE_API_FUNC(RedisModule_GetKeyNameFromModuleKey)(RedisModuleKey *key);
 long long REDISMODULE_API_FUNC(RedisModule_Milliseconds)(void);
 void REDISMODULE_API_FUNC(RedisModule_DigestAddStringBuffer)(RedisModuleDigest *md, unsigned char *ele, size_t len);
 void REDISMODULE_API_FUNC(RedisModule_DigestAddLongLong)(RedisModuleDigest *md, long long ele);
@@ -511,6 +522,8 @@ void REDISMODULE_API_FUNC(RedisModule_FreeThreadSafeContext)(RedisModuleCtx *ctx
 void REDISMODULE_API_FUNC(RedisModule_ThreadSafeContextLock)(RedisModuleCtx *ctx);
 void REDISMODULE_API_FUNC(RedisModule_ThreadSafeContextUnlock)(RedisModuleCtx *ctx);
 int REDISMODULE_API_FUNC(RedisModule_SubscribeToKeyspaceEvents)(RedisModuleCtx *ctx, int types, RedisModuleNotificationFunc cb);
+int REDISMODULE_API_FUNC(RedisModule_NotifyKeyspaceEvent)(RedisModuleCtx *ctx, int type, const char *event, RedisModuleString *key);
+int REDISMODULE_API_FUNC(RedisModule_GetNotifyKeyspaceEvents)();
 int REDISMODULE_API_FUNC(RedisModule_BlockedClientDisconnected)(RedisModuleCtx *ctx);
 void REDISMODULE_API_FUNC(RedisModule_RegisterClusterMessageReceiver)(RedisModuleCtx *ctx, uint8_t type, RedisModuleClusterMessageReceiver callback);
 int REDISMODULE_API_FUNC(RedisModule_SendClusterMessage)(RedisModuleCtx *ctx, char *target_id, uint8_t type, unsigned char *msg, uint32_t len);
@@ -632,6 +645,7 @@ static int RedisModule_Init(RedisModuleCtx *ctx, const char *name, int ver, int
     REDISMODULE_GET_API(ModuleTypeGetValue);
     REDISMODULE_GET_API(IsIOError);
     REDISMODULE_GET_API(SetModuleOptions);
+    REDISMODULE_GET_API(SignalModifiedKey);
     REDISMODULE_GET_API(SaveUnsigned);
     REDISMODULE_GET_API(LoadUnsigned);
     REDISMODULE_GET_API(SaveSigned);
@@ -654,6 +668,7 @@ static int RedisModule_Init(RedisModuleCtx *ctx, const char *name, int ver, int
     REDISMODULE_GET_API(StringCompare);
     REDISMODULE_GET_API(GetContextFromIO);
     REDISMODULE_GET_API(GetKeyNameFromIO);
+    REDISMODULE_GET_API(GetKeyNameFromModuleKey);
     REDISMODULE_GET_API(Milliseconds);
     REDISMODULE_GET_API(DigestAddStringBuffer);
     REDISMODULE_GET_API(DigestAddLongLong);
@@ -709,6 +724,8 @@ static int RedisModule_Init(RedisModuleCtx *ctx, const char *name, int ver, int
     REDISMODULE_GET_API(AbortBlock);
     REDISMODULE_GET_API(SetDisconnectCallback);
     REDISMODULE_GET_API(SubscribeToKeyspaceEvents);
+    REDISMODULE_GET_API(NotifyKeyspaceEvent);
+    REDISMODULE_GET_API(GetNotifyKeyspaceEvents);
     REDISMODULE_GET_API(BlockedClientDisconnected);
     REDISMODULE_GET_API(RegisterClusterMessageReceiver);
     REDISMODULE_GET_API(SendClusterMessage);
diff --git a/tests/modules/Makefile b/tests/modules/Makefile
index f357faad2e21e7145b41ae5a9965c1f6c80bc175..71c0b5ef80ff74852bfc3a84c27f643332358d98 100644
--- a/tests/modules/Makefile
+++ b/tests/modules/Makefile
@@ -17,6 +17,7 @@ TEST_MODULES = \
     fork.so \
     infotest.so \
     propagate.so \
+    misc.so \
     hooks.so
 
 .PHONY: all
diff --git a/tests/modules/fork.c b/tests/modules/fork.c
index 0804e4355ab37bed77298f584ad6078541f44b76..1a139ef1bef50eed10f40a8c5239a3777aa38549 100644
--- a/tests/modules/fork.c
+++ b/tests/modules/fork.c
@@ -1,6 +1,10 @@
 #define REDISMODULE_EXPERIMENTAL_API
-#include "redismodule.h"
 
+/* define macros for having usleep */
+#define _BSD_SOURCE
+#define _DEFAULT_SOURCE
+
+#include "redismodule.h"
 #include <string.h>
 #include <assert.h>
 #include <unistd.h>
diff --git a/tests/modules/misc.c b/tests/modules/misc.c
new file mode 100644
index 0000000000000000000000000000000000000000..fd892f52cf2c60f7f17e5e7974a7f720d378fc1f
--- /dev/null
+++ b/tests/modules/misc.c
@@ -0,0 +1,55 @@
+#define REDISMODULE_EXPERIMENTAL_API
+#include "redismodule.h"
+
+#include <string.h>
+#include <assert.h>
+#include <unistd.h>
+#include <errno.h>
+
+int test_call_generic(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
+{
+    if (argc<2) {
+        RedisModule_WrongArity(ctx);
+        return REDISMODULE_OK;
+    }
+
+    const char* cmdname = RedisModule_StringPtrLen(argv[1], NULL);
+    RedisModuleCallReply *reply = RedisModule_Call(ctx, cmdname, "v", argv+2, argc-2);
+    if (reply) {
+        RedisModule_ReplyWithCallReply(ctx, reply);
+        RedisModule_FreeCallReply(reply);
+    } else {
+        RedisModule_ReplyWithError(ctx, strerror(errno));
+    }
+    return REDISMODULE_OK;
+}
+
+int test_call_info(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
+{
+    RedisModuleCallReply *reply;
+    if (argc>1)
+        reply = RedisModule_Call(ctx, "info", "s", argv[1]);
+    else
+        reply = RedisModule_Call(ctx, "info", "");
+    if (reply) {
+        RedisModule_ReplyWithCallReply(ctx, reply);
+        RedisModule_FreeCallReply(reply);
+    } else {
+        RedisModule_ReplyWithError(ctx, strerror(errno));
+    }
+    return REDISMODULE_OK;
+}
+
+int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
+    REDISMODULE_NOT_USED(argv);
+    REDISMODULE_NOT_USED(argc);
+    if (RedisModule_Init(ctx,"misc",1,REDISMODULE_APIVER_1)== REDISMODULE_ERR)
+        return REDISMODULE_ERR;
+
+    if (RedisModule_CreateCommand(ctx,"test.call_generic", test_call_generic,"",0,0,0) == REDISMODULE_ERR)
+        return REDISMODULE_ERR;
+    if (RedisModule_CreateCommand(ctx,"test.call_info", test_call_info,"",0,0,0) == REDISMODULE_ERR)
+        return REDISMODULE_ERR;
+
+    return REDISMODULE_OK;
+}
diff --git a/tests/unit/moduleapi/misc.tcl b/tests/unit/moduleapi/misc.tcl
new file mode 100644
index 0000000000000000000000000000000000000000..d392aeab0594c30bbfb38db5e8845037716db688
--- /dev/null
+++ b/tests/unit/moduleapi/misc.tcl
@@ -0,0 +1,19 @@
+set testmodule [file normalize tests/modules/misc.so]
+
+
+start_server {tags {"modules"}} {
+    r module load $testmodule
+
+    test {test RM_Call} {
+        set info [r test.call_info commandstats]
+        # cmdstat is not in a default section, so we also test an argument was passed
+        assert { [string match "*cmdstat_module*" $info] }
+    }
+
+    test {test RM_Call args array} {
+        set info [r test.call_generic info commandstats]
+        # cmdstat is not in a default section, so we also test an argument was passed
+        assert { [string match "*cmdstat_module*" $info] }
+    }
+
+}