Update runtime files.
diff --git a/runtime/doc/sign.txt b/runtime/doc/sign.txt
index 0903976..519a3d3 100644
--- a/runtime/doc/sign.txt
+++ b/runtime/doc/sign.txt
@@ -1,4 +1,4 @@
-*sign.txt*      For Vim version 8.1.  Last change: 2019 May 05
+*sign.txt*      For Vim version 8.1.  Last change: 2019 Jun 04
 
 
 		  VIM REFERENCE MANUAL    by Gordon Prieur