diff --git a/include/rocksdb/file_system.h b/include/rocksdb/file_system.h
index f8e321417ce..7e9d5d4feab 100644
--- a/include/rocksdb/file_system.h
+++ b/include/rocksdb/file_system.h
@@ -120,6 +120,7 @@ struct IOOptions {
   // directories and list only files in GetChildren API.
   bool do_not_recurse;
 
+  // EXPERIMENTAL
   Env::IOActivity io_activity = Env::IOActivity::kUnknown;
 
   IOOptions() : IOOptions(false) {}
diff --git a/include/rocksdb/options.h b/include/rocksdb/options.h
index b20c66e14be..ae6b5cf6d2d 100644
--- a/include/rocksdb/options.h
+++ b/include/rocksdb/options.h
@@ -1752,9 +1752,13 @@ struct ReadOptions {
 
   // *** END options only relevant to iterators or scans ***
 
-  // ** For RocksDB internal use only **
+  // *** BEGIN options for RocksDB internal use only ***
+
+  // EXPERIMENTAL
   Env::IOActivity io_activity = Env::IOActivity::kUnknown;
 
+  // *** END options for RocksDB internal use only ***
+
   ReadOptions() {}
   ReadOptions(bool _verify_checksums, bool _fill_cache);
   explicit ReadOptions(Env::IOActivity _io_activity);