diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 726ba59e2b..59291a8334 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -1191,10 +1191,6 @@ pgss_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 /*
  * Store some statistics for a statement.
  *
- * If queryId is 0 then this is a utility statement for which we couldn't
- * compute a queryId during parse analysis, and we should compute a suitable
- * queryId internally.
- *
  * If jstate is not NULL then we're trying to create an entry for which
  * we have no statistics as yet; we just want to record the normalized
  * query string.  total_time, rows, bufusage and walusage are ignored in this
@@ -1202,6 +1198,9 @@ pgss_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
  *
  * If kind is PGSS_PLAN or PGSS_EXEC, its value is used as the array position
  * for the arrays in the Counters field.
+ *
+ * queryId is supposed to be a valid value, otherwise this function dosen't
+ * calucate it by its own as before then returns immediately.
  */
 static void
 pgss_store(const char *query, uint64 queryId,