1 files changed, 1 insertions, 1 deletions
diff --git a/file.c b/file.c
index fadee48e9b..89afe7a0d0 100644
--- a/file.c
+++ b/file.c
@@ -7707,7 +7707,7 @@ Init_File(void)
      * Flag File::FNM_EXTGLOB enables pattern <tt>'{_a_,_b_}'</tt>,
      * which matches pattern '_a_' and pattern '_b_';
      * behaves like
-     * a {regexp union}[https://docs.ruby-lang.org/en/master/Regexp.html#method-c-union]
+     * a {regexp union}[rdoc-ref:Regexp.union]
      * (e.g., <tt>'(?:_a_|_b_)'</tt>):
      *
      *   pattern = '{LEGAL,BSDL}'