diff --git a/db/db_impl/db_impl.cc b/db/db_impl/db_impl.cc
index aa2cdac512731eed8952b86d568a9ba7e6fc346a..3b0fc951946a3a9eebb8cd65f5f620a3bcc42038 100644
--- a/db/db_impl/db_impl.cc
+++ b/db/db_impl/db_impl.cc
@@ -567,7 +567,7 @@ Status DBImpl::CloseHelper() {
   // flushing by first checking if there is a need for
   // flushing (but need to implement something
   // else than imm()->IsFlushPending() because the output
-  // memtables added to imm() dont trigger flushes).
+  // memtables added to imm() don't trigger flushes).
   if (immutable_db_options_.experimental_mempurge_threshold > 0.0) {
     Status flush_ret;
     mutex_.Unlock();
diff --git a/db/memtable_list.h b/db/memtable_list.h
index 6df0e7c02ee7beddd5249b74a1d1184e76b3e47d..866ecccb6f5ff16225d292c884e57baa8a779090 100644
--- a/db/memtable_list.h
+++ b/db/memtable_list.h
@@ -315,7 +315,7 @@ class MemTableList {
   // PickMemtablesToFlush() is called.
   void FlushRequested() {
     flush_requested_ = true;
-    // If there are some memtables stored in imm() that dont trigger
+    // If there are some memtables stored in imm() that don't trigger
     // flush (eg: mempurge output memtable), then update imm_flush_needed.
     // Note: if race condition and imm_flush_needed is set to true
     // when there is num_flush_not_started_==0, then there is no
diff --git a/include/rocksdb/write_batch.h b/include/rocksdb/write_batch.h
index 4078ceeaaf14f3c50383608be52b4a72bcefa274..618e4734c86c9dc32b9754fa9e2c24f07ecdb961 100644
--- a/include/rocksdb/write_batch.h
+++ b/include/rocksdb/write_batch.h
@@ -385,7 +385,7 @@ class WriteBatch : public WriteBatchBase {
   //
   // in: cf, the column family id.
   // ret: timestamp size of the given column family. Return
-  //      std::numeric_limits<size_t>::max() indicating "dont know or column
+  //      std::numeric_limits<size_t>::max() indicating "don't know or column
   //      family info not found", this will cause UpdateTimestamps() to fail.
   // size_t ts_sz_func(uint32_t cf);
   Status UpdateTimestamps(const Slice& ts,