diff --git a/runtime/doc/index.txt b/runtime/doc/index.txt
index d1c3c87..f20c706 100644
--- a/runtime/doc/index.txt
+++ b/runtime/doc/index.txt
@@ -1,4 +1,4 @@
-*index.txt*     For Vim version 8.1.  Last change: 2019 Jun 09
+*index.txt*     For Vim version 8.1.  Last change: 2019 Jun 16
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1241,6 +1241,7 @@
 |:compiler|	:comp[iler]	do settings for a specific compiler
 |:continue|	:con[tinue]	go back to :while
 |:confirm|	:conf[irm]	prompt user when confirmation required
+|:const|	:cons[t]	create a variable as a constant
 |:copen|	:cope[n]	open quickfix window
 |:cprevious|	:cp[revious]	go to previous error
 |:cpfile|	:cpf[ile]	go to last error in previous file