1 files changed, 2 insertions, 1 deletions

diff --git a/src/coding.c b/src/coding.c
index 01fcfb08782..78ba80c35ee 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -7265,7 +7265,8 @@ See also the function `find-operation-coding-system'.");
   Vnetwork_coding_system_alist = Qnil;
 
   DEFVAR_LISP ("locale-coding-system", &Vlocale_coding_system,
-    "Coding system to use with system messages.");
+    "Coding system to use with system messages.  Also used for decoding\n\
+keyboard input on X Window system.");
   Vlocale_coding_system = Qnil;
 
   /* The eol mnemonics are reset in startup.el system-dependently.  */