Clarify key sequence usage conventions.

diff --git a/lispref/tips.texi b/lispref/tips.texi
index c66b71033c24d910bfdcc8302d9374d39d6af3f1..dc1a31545a57ed206f02a2798c53bb80b8b337b6 100644 (file)
--- a/lispref/tips.texi
+++ b/lispref/tips.texi
@@ -103,8 +103,9 @@ modes.  These sequences are reserved for users; they are the
 @strong{only} sequences reserved for users, so we cannot do without
 them.
 
-Instead, define sequences consisting of @kbd{C-c} followed by a
-non-letter.  These sequences are reserved for major modes.
+Instead, define sequences consisting of @kbd{C-c} followed by a control
+character, a digit, or certain punctuation characters.  These sequences
+are reserved for major modes.
 
 Changing all the major modes in Emacs 18 so they would follow this
 convention was a lot of work.  Abandoning this convention would make