diff --git a/src/main/java/com/google/devtools/build/lib/buildeventstream/proto/build_event_stream.proto b/src/main/java/com/google/devtools/build/lib/buildeventstream/proto/build_event_stream.proto
index 80155cbd8c40dd..13e143c4baa163 100644
--- a/src/main/java/com/google/devtools/build/lib/buildeventstream/proto/build_event_stream.proto
+++ b/src/main/java/com/google/devtools/build/lib/buildeventstream/proto/build_event_stream.proto
@@ -613,7 +613,7 @@ message OutputGroup {
   bool incomplete = 4;
 
   // Inlined files that belong to this output group, requested via
-  // --build_event_inline_output_groups.
+  // --experimental_build_event_output_group_mode.
   repeated File inline_files = 5;
 }