Updated runtime files.
diff --git a/runtime/doc/message.txt b/runtime/doc/message.txt
index d41915e..65c222d 100644
--- a/runtime/doc/message.txt
+++ b/runtime/doc/message.txt
@@ -1,4 +1,4 @@
-*message.txt* For Vim version 7.4. Last change: 2016 Apr 14
+*message.txt* For Vim version 7.4. Last change: 2016 Jul 14
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -673,6 +673,12 @@
have the same number, which causes various problems. You might want to exit
Vim and restart it.
+ *E931* >
+ Buffer cannot be registered
+
+Out of memory or a duplicate buffer number. May habben after W14. Looking up
+a buffer will not always work, better restart Vim.
+
*E296* *E297* >
Seek error in swap file write
Write error in swap file