Update runtime files.
diff --git a/runtime/doc/digraph.txt b/runtime/doc/digraph.txt
index 62f23a2..14a5676 100644
--- a/runtime/doc/digraph.txt
+++ b/runtime/doc/digraph.txt
@@ -111,11 +111,14 @@
You may have problems using Vim with characters which have a value above 128.
For example: You insert ue (u-umlaut) and the editor echoes \334 in Insert
-mode. After leaving the Insert mode everything is fine. Note that fmt
-removes all characters with a value above 128 from the text being formatted.
-On some Unix systems this means you have to define the environment-variable
-LC_CTYPE. If you are using csh, then put the following line in your .cshrc: >
- setenv LC_CTYPE iso_8859_1
+mode. After leaving the Insert mode everything is fine. On some Unix systems
+this means you have to define the environment-variable LC_CTYPE. If you are
+using csh, then put the following line in your .cshrc: >
+ setenv LC_CTYPE en_US.utf8
+(or similar for a different language or country). The value must be a valid
+locale on your system, i.e. on Unix-like systems it must be present in the
+output of >
+ locale -a
==============================================================================
3. Default digraphs *digraphs-default*