diff --git a/src/include/nodes/pathnodes.h b/src/include/nodes/pathnodes.h
index ed85dc7414..189b59f127 100644
--- a/src/include/nodes/pathnodes.h
+++ b/src/include/nodes/pathnodes.h
@@ -2791,7 +2791,8 @@ typedef struct PlaceHolderVar
  *
  * ojrelid is the RT index of the join RTE representing this outer join,
  * if there is one.  It is zero when jointype is INNER or SEMI, and can be
- * zero for jointype ANTI (if the join was transformed from a SEMI join).
+ * zero for jointype ANTI (if the join was transformed from a SEMI join or
+ * converted from a sublink).
  * One use for this field is that when constructing the output targetlist of a
  * join relation that implements this OJ, we add ojrelid to the varnullingrels
  * and phnullingrels fields of nullable (RHS) output columns, so that the