diff --git a/src/include/nodes/pathnodes.h b/src/include/nodes/pathnodes.h
index 3c034fa3c5e..2a8977c9722 100644
--- a/src/include/nodes/pathnodes.h
+++ b/src/include/nodes/pathnodes.h
@@ -796,9 +796,10 @@ typedef struct RelOptInfo
  * IndexOptInfo
  *		Per-index information for planning/optimization
  *
- *		indexkeys[], indexcollations[] each have ncolumns entries.
- *		opfamily[], and opcintype[]	each have nkeycolumns entries. They do
- *		not contain any information about included attributes.
+ *		indexkeys[] and canreturn[] each have ncolumns entries.
+ *
+ *		indexcollations[], opfamily[], and opcintype[] each have nkeycolumns
+ *		entries.  These don't contain any information about INCLUDE columns.
  *
  *		sortopfamily[], reverse_sort[], and nulls_first[] have
  *		nkeycolumns entries, if the index is ordered; but if it is unordered,