diff --git a/core/build.sh b/core/build.sh
index 85dea0ab881616f5ca1dfc3a84bf6cab1b0c2bc0..7d901e3c41c5c09ccbdcde5436e9da6473979b34 100755
--- a/core/build.sh
+++ b/core/build.sh
@@ -18,64 +18,64 @@ FAISS_ROOT="" #FAISS root path
 FAISS_SOURCE="BUNDLED"
 WITH_PROMETHEUS="ON"
 
-while getopts "p:d:t:f:ulrcgjhxzme" arg
-do
-        case $arg in
-             p)
-                INSTALL_PREFIX=$OPTARG
-                ;;
-             d)
-                DB_PATH=$OPTARG
-                ;;
-             t)
-                BUILD_TYPE=$OPTARG # BUILD_TYPE
-                ;;
-             f)
-                FAISS_ROOT=$OPTARG
-                FAISS_SOURCE="AUTO"
-                ;;
-             u)
-                echo "Build and run unittest cases" ;
-                BUILD_UNITTEST="ON";
-                ;;
-             l)
-                RUN_CPPLINT="ON"
-                ;;
-             r)
-                if [[ -d ${BUILD_OUTPUT_DIR} ]]; then
-                    rm ./${BUILD_OUTPUT_DIR} -r
-                    MAKE_CLEAN="ON"
-                fi
-                ;;
-             c)
-                BUILD_COVERAGE="ON"
-                ;;
-             z)
-                PROFILING="ON"
-                ;;
-             j)
-                USE_JFROG_CACHE="ON"
-                ;;
-             x)
-                CUSTOMIZATION="OFF" # force use ori faiss
-                ;;
-             g)
-                GPU_VERSION="ON"
-                ;;
-             m)
-                WITH_MKL="ON"
-                ;;
-             e)
-               WITH_PROMETHEUS="OFF"
-                ;;
-             h) # help
-                echo "
+while getopts "p:d:t:f:ulrcgjhxzme" arg; do
+  case $arg in
+  p)
+    INSTALL_PREFIX=$OPTARG
+    ;;
+  d)
+    DB_PATH=$OPTARG
+    ;;
+  t)
+    BUILD_TYPE=$OPTARG # BUILD_TYPE
+    ;;
+  f)
+    FAISS_ROOT=$OPTARG
+    FAISS_SOURCE="AUTO"
+    ;;
+  u)
+    echo "Build and run unittest cases"
+    BUILD_UNITTEST="ON"
+    ;;
+  l)
+    RUN_CPPLINT="ON"
+    ;;
+  r)
+    if [[ -d ${BUILD_OUTPUT_DIR} ]]; then
+      rm ./${BUILD_OUTPUT_DIR} -r
+      MAKE_CLEAN="ON"
+    fi
+    ;;
+  c)
+    BUILD_COVERAGE="ON"
+    ;;
+  z)
+    PROFILING="ON"
+    ;;
+  j)
+    USE_JFROG_CACHE="ON"
+    ;;
+  x)
+    CUSTOMIZATION="OFF" # force use ori faiss
+    ;;
+  g)
+    GPU_VERSION="ON"
+    ;;
+  m)
+    WITH_MKL="ON"
+    ;;
+  e)
+    WITH_PROMETHEUS="OFF"
+    ;;
+  h) # help
+    echo "
 
 parameter:
 -p: install prefix(default: $(pwd)/milvus)
 -d: db data path(default: /tmp/milvus)
 -t: build type(default: Debug)
--f: faiss root path(default: empty)
+-f: FAISS root path(default: empty). The path should be an absolute path
+    containing the pre-installed lib/ and include/ directory of FAISS
 -u: building unit test options(default: OFF)
 -l: run cpplint, clang-format and clang-tidy(default: OFF)
 -r: remove previous build directory(default: OFF)
@@ -84,30 +84,30 @@ parameter:
 -j: use jfrog cache build directory(default: OFF)
 -g: build GPU version(default: OFF)
 -m: build with MKL(default: OFF)
--e: build without prometheus
+-e: build without prometheus(default: OFF)
 -h: help
 
 usage:
 ./build.sh -p \${INSTALL_PREFIX} -t \${BUILD_TYPE} -f \${FAISS_ROOT} [-u] [-l] [-r] [-c] [-z] [-j] [-g] [-m] [-e] [-h]
                 "
-                exit 0
-                ;;
-             ?)
-                echo "ERROR! unknown argument"
-        exit 1
-        ;;
-        esac
+    exit 0
+    ;;
+  ?)
+    echo "ERROR! unknown argument"
+    exit 1
+    ;;
+  esac
 done
 
 if [[ ! -d ${BUILD_OUTPUT_DIR} ]]; then
-    mkdir ${BUILD_OUTPUT_DIR}
+  mkdir ${BUILD_OUTPUT_DIR}
 fi
 
 cd ${BUILD_OUTPUT_DIR}
 
 # remove make cache since build.sh -l use default variables
 # force update the variables each time
-make rebuild_cache > /dev/null 2>&1
+make rebuild_cache >/dev/null 2>&1
 
 CMAKE_CMD="cmake \
 -DBUILD_UNIT_TEST=${BUILD_UNITTEST} \
@@ -129,25 +129,25 @@ echo ${CMAKE_CMD}
 ${CMAKE_CMD}
 
 if [[ ${MAKE_CLEAN} == "ON" ]]; then
-    make clean
+  make clean
 fi
 
 if [[ ${RUN_CPPLINT} == "ON" ]]; then
-    # cpplint check
-    make lint
-    if [ $? -ne 0 ]; then
-        echo "ERROR! cpplint check failed"
-        exit 1
-    fi
-    echo "cpplint check passed!"
+  # cpplint check
+  make lint
+  if [ $? -ne 0 ]; then
+    echo "ERROR! cpplint check failed"
+    exit 1
+  fi
+  echo "cpplint check passed!"
 
-    # clang-format check
-    make check-clang-format
-    if [ $? -ne 0 ]; then
-        echo "ERROR! clang-format check failed"
-        exit 1
-    fi
-    echo "clang-format check passed!"
+  # clang-format check
+  make check-clang-format
+  if [ $? -ne 0 ]; then
+    echo "ERROR! clang-format check failed"
+    exit 1
+  fi
+  echo "clang-format check passed!"
 
 #    # clang-tidy check
 #    make check-clang-tidy
@@ -158,11 +158,11 @@ if [[ ${RUN_CPPLINT} == "ON" ]]; then
 #    echo "clang-tidy check passed!"
 else
 
-    # strip binary symbol
-    if [[ ${BUILD_TYPE} != "Debug" ]]; then
-        strip src/milvus_server
-    fi
+  # strip binary symbol
+  if [[ ${BUILD_TYPE} != "Debug" ]]; then
+    strip src/milvus_server
+  fi
 
-    # compile and build
-    make -j 8 install || exit 1
+  # compile and build
+  make -j 8 install || exit 1
 fi
diff --git a/install.md b/install.md
index 4d2088a3be14ecb48c327e36a2a19500da9fef3d..6711b41f76011f1193cab429d34750ca839b7b1d 100644
--- a/install.md
+++ b/install.md
@@ -29,10 +29,15 @@ $ ./build.sh -t Release
 ```
 
 By default, it will build CPU version. To build GPU version, add `-g` option
-```
+```shell
 $ ./build.sh -g
 ```
 
+If you want to know the complete build options, run
+```shell
+$./build.sh -h
+```
+
 When the build is completed, all the stuff that you need in order to run Milvus will be installed under `[Milvus root path]/core/milvus`.
 
 ## Launch Milvus server
@@ -43,13 +48,13 @@ $ cd [Milvus root path]/core/milvus
 
 Add `lib/` directory to `LD_LIBRARY_PATH`
 
-```
+```shell
 $ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:[Milvus root path]/core/milvus/lib
 ```
 
 Then start Milvus server:
 
-```
+```shell
 $ cd scripts
 $ ./start_server.sh
 ```
@@ -65,7 +70,7 @@ $ ./stop_server.sh
 `protocol https not supported or disabled in libcurl`.
 First, make sure you have `libcurl4-openssl-dev` installed in your system.
 Then try reinstall CMake from source with `--system-curl` option:
-```
+```shell
 $ ./bootstrap --system-curl 
 $ make 
 $ sudo make install