diff --git a/src/backend/postmaster/pgstat.c b/src/backend/postmaster/pgstat.c
index bed7bb18e6..1467355fdd 100644
--- a/src/backend/postmaster/pgstat.c
+++ b/src/backend/postmaster/pgstat.c
@@ -2905,8 +2905,8 @@ pgstat_progress_update_param(int index, int64 val)
 /*-----------
  * pgstat_progress_update_multi_param() -
  *
- * Automatically update multiple members in st_progress_param[] of own backend
- * entry.
+ * Update multiple members in st_progress_param[] of own backend entry.
+ * This is atomic; readers won't see intermediate states.
  *-----------
  */
 void