Updated runtime files.
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 9015c8c..dd679cc 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1,4 +1,4 @@
-*eval.txt* For Vim version 7.4. Last change: 2015 Apr 11
+*eval.txt* For Vim version 7.4. Last change: 2015 Apr 30
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -2961,6 +2961,8 @@
{expr1} is changed when {expr2} is not empty. If necessary
make a copy of {expr1} first.
{expr2} remains unchanged.
+ When {expr1} is locked and {expr2} is not empty the operation
+ fails.
Returns {expr1}.