Update runtime files.
diff --git a/runtime/doc/cmdline.txt b/runtime/doc/cmdline.txt
index 989bd25..a0e37b5 100644
--- a/runtime/doc/cmdline.txt
+++ b/runtime/doc/cmdline.txt
@@ -1,4 +1,4 @@
-*cmdline.txt* For Vim version 8.0. Last change: 2017 Jul 11
+*cmdline.txt* For Vim version 8.0. Last change: 2017 Sep 17
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -826,6 +826,7 @@
*:<cword>* *:<cWORD>* *:<cfile>* *<cfile>*
*:<sfile>* *<sfile>* *:<afile>* *<afile>*
*:<abuf>* *<abuf>* *:<amatch>* *<amatch>*
+ *:<cexpr>* *<cexpr>*
*<slnum>* *E495* *E496* *E497* *E499* *E500*
Note: these are typed literally, they are not special keys!
<cword> is replaced with the word under the cursor (like |star|)