diff --git a/include/rocksdb/db.h b/include/rocksdb/db.h
index 0f9901f273baf897aa8653e0a7d7611d3fbb3f44..9e886c28f5b4fdd842172359973868b464e4b841 100644
--- a/include/rocksdb/db.h
+++ b/include/rocksdb/db.h
@@ -924,6 +924,8 @@ class DB {
 
     //  "rocksdb.is-file-deletions-enabled" - returns 0 if deletion of obsolete
     //      files is enabled; otherwise, returns a non-zero number.
+    //  This name may be misleading because true(non-zero) means disable,
+    //  but we keep the name for backward compatibility.
     static const std::string kIsFileDeletionsEnabled;
 
     //  "rocksdb.num-snapshots" - returns number of unreleased snapshots of the