diff --git a/src/backend/utils/activity/pgstat_database.c b/src/backend/utils/activity/pgstat_database.c
index c0c02efd9d3..b99093f397b 100644
--- a/src/backend/utils/activity/pgstat_database.c
+++ b/src/backend/utils/activity/pgstat_database.c
@@ -376,8 +376,8 @@ pgstat_reset_database_timestamp(Oid dboid, TimestampTz ts)
 /*
  * Flush out pending stats for the entry
  *
- * If nowait is true, this function returns false if lock could not
- * immediately acquired, otherwise true is returned.
+ * If nowait is true and the lock could not be immediately acquired, returns
+ * false without flushing the entry.  Otherwise returns true.
  */
 bool
 pgstat_database_flush_cb(PgStat_EntryRef *entry_ref, bool nowait)
diff --git a/src/backend/utils/activity/pgstat_function.c b/src/backend/utils/activity/pgstat_function.c
index bc4e254d02d..6214f93d36e 100644
--- a/src/backend/utils/activity/pgstat_function.c
+++ b/src/backend/utils/activity/pgstat_function.c
@@ -186,8 +186,8 @@ pgstat_end_function_usage(PgStat_FunctionCallUsage *fcu, bool finalize)
 /*
  * Flush out pending stats for the entry
  *
- * If nowait is true, this function returns false if lock could not
- * immediately acquired, otherwise true is returned.
+ * If nowait is true and the lock could not be immediately acquired, returns
+ * false without flushing the entry.  Otherwise returns true.
  */
 bool
 pgstat_function_flush_cb(PgStat_EntryRef *entry_ref, bool nowait)
diff --git a/src/backend/utils/activity/pgstat_relation.c b/src/backend/utils/activity/pgstat_relation.c
index d64595a165c..5d7cee75cd0 100644
--- a/src/backend/utils/activity/pgstat_relation.c
+++ b/src/backend/utils/activity/pgstat_relation.c
@@ -806,8 +806,8 @@ pgstat_twophase_postabort(TransactionId xid, uint16 info,
 /*
  * Flush out pending stats for the entry
  *
- * If nowait is true, this function returns false if lock could not
- * immediately acquired, otherwise true is returned.
+ * If nowait is true and the lock could not be immediately acquired, returns
+ * false without flushing the entry.  Otherwise returns true.
  *
  * Some of the stats are copied to the corresponding pending database stats
  * entry when successfully flushing.
diff --git a/src/backend/utils/activity/pgstat_subscription.c b/src/backend/utils/activity/pgstat_subscription.c
index 830d408c61a..f9a1c831a07 100644
--- a/src/backend/utils/activity/pgstat_subscription.c
+++ b/src/backend/utils/activity/pgstat_subscription.c
@@ -96,8 +96,8 @@ pgstat_fetch_stat_subscription(Oid subid)
 /*
  * Flush out pending stats for the entry
  *
- * If nowait is true, this function returns false if lock could not
- * immediately acquired, otherwise true is returned.
+ * If nowait is true and the lock could not be immediately acquired, returns
+ * false without flushing the entry.  Otherwise returns true.
  */
 bool
 pgstat_subscription_flush_cb(PgStat_EntryRef *entry_ref, bool nowait)