diff --git a/src/backend/access/transam/slru.c b/src/backend/access/transam/slru.c
index b65cb49d7ff..3afd5340911 100644
--- a/src/backend/access/transam/slru.c
+++ b/src/backend/access/transam/slru.c
@@ -182,6 +182,7 @@ SimpleLruShmemSize(int nslots, int nlsns)
  * ctllock: LWLock to use to control access to the shared control structure.
  * subdir: PGDATA-relative subdirectory that will contain the files.
  * tranche_id: LWLock tranche ID to use for the SLRU's per-buffer LWLocks.
+ * sync_handler: which set of functions to use to handle sync requests
  */
 void
 SimpleLruInit(SlruCtl ctl, const char *name, int nslots, int nlsns,