diff --git a/db/memtable.cc b/db/memtable.cc
index 64ee41648..1f6a9d266 100644
--- a/db/memtable.cc
+++ b/db/memtable.cc
@@ -116,7 +116,7 @@ bool MemTable::Get(const LookupKey& key, std::string* value, Status* s) {
   if (iter.Valid()) {
     // entry format is:
     //    klength  varint32
-    //    userkey  char[klength]
+    //    userkey  char[klength-8]
     //    tag      uint64
     //    vlength  varint32
     //    value    char[vlength]
diff --git a/db/memtable.h b/db/memtable.h
index c70f2dc3e..31e2aef1d 100644
--- a/db/memtable.h
+++ b/db/memtable.h
@@ -49,7 +49,7 @@ class MemTable {
   // The caller must ensure that the underlying MemTable remains live
   // while the returned iterator is live.  The keys returned by this
   // iterator are internal keys encoded by AppendInternalKey in the
-  // db/format.{h,cc} module.
+  // db/dbformat.{h,cc} module.
   Iterator* NewIterator();
 
   // Add an entry into memtable that maps key to value at the
diff --git a/db/memtablelist.h b/db/memtablelist.h
index 721b344ab..266799f4b 100644
--- a/db/memtablelist.h
+++ b/db/memtablelist.h
@@ -63,6 +63,7 @@ class MemTableList {
                       std::set<uint64_t>& pending_outputs);
 
   // New memtables are inserted at the front of the list.
+  // Takes ownership of the referenced held on *m by the caller of Add().
   void Add(MemTable* m);
 
   // Returns an estimate of the number of bytes of data in use.