diff --git a/lispref/syntax.texi b/lispref/syntax.texi
index 85dcb83bd50..47f09944880 100644
--- a/lispref/syntax.texi
+++ b/lispref/syntax.texi
@@ -873,7 +873,8 @@ can still override the syntax.)
 @defopt parse-sexp-ignore-comments
 @cindex skipping comments
 If the value is non-@code{nil}, then comments are treated as
-whitespace by the functions in this section and by @code{forward-sexp}.
+whitespace by the functions in this section and by @code{forward-sexp},
+@code{scan-lists} and @code{scan-sexps}.
 @end defopt
 
 @vindex parse-sexp-lookup-properties