diff --git a/runtime/doc/message.txt b/runtime/doc/message.txt
index 638d7c7..65cd8df 100644
--- a/runtime/doc/message.txt
+++ b/runtime/doc/message.txt
@@ -1,4 +1,4 @@
-*message.txt*   For Vim version 8.1.  Last change: 2018 Dec 30
+*message.txt*   For Vim version 8.1.  Last change: 2019 Apr 04
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -703,11 +703,13 @@
 This happens when an Ex command with mandatory argument(s) was executed, but
 no argument has been specified.
 
-							*E474* *E475*  >
+							*E474* *E475* *E983*  >
   Invalid argument
   Invalid argument: {arg}
+  Duplicate argument: {arg}
 
-An Ex command has been executed, but an invalid argument has been specified.
+An Ex command or function has been executed, but an invalid argument has been
+specified.
 
 							*E488*  >
   Trailing characters