diff --git a/doc/spec/control-spec.txt b/doc/spec/control-spec.txt
index 69f72818b6..d1cab4f6ce 100644
--- a/doc/spec/control-spec.txt
+++ b/doc/spec/control-spec.txt
@@ -133,7 +133,7 @@ $Id$
 
 3. Commands
 
-  All commands and other keywords are case-insensitive.
+  All commands are case-insensitive, but most keywords are case-sensitive.
 
 3.1. SETCONF