diff --git a/runtime/doc/vimdiff.1 b/runtime/doc/vimdiff.1
index ddcb30f..efbb84a 100644
--- a/runtime/doc/vimdiff.1
+++ b/runtime/doc/vimdiff.1
@@ -1,4 +1,4 @@
-.TH VIMDIFF 1 "2001 March 30"
+.TH VIMDIFF 1 "2021 June 13"
 .SH NAME
 vimdiff \- edit between two and eight versions of a file with Vim and show differences
 .SH SYNOPSIS