Sharpen the description of preference names.

svn path=/trunk/; revision=35671

diff --git a/doc/README.developer b/doc/README.developer
index fdafef1c47f8412bc14cfc25fb6fed357cd0d163..fc047a717021b5c77b5d5874afca7daa51cb34bd 100644 (file)
--- a/doc/README.developer
+++ b/doc/README.developer
@@ -3595,7 +3595,9 @@ Where: module - Returned by the prefs_register_protocol routine
                    "." between them, to construct a name that identifies
                    the field in the preference file; the name itself
                    should not include the protocol name, as the name in
-                   the preference file will already have it
+                   the preference file will already have it. Make sure that
+                   only lower-case ASCII letters, numbers, underscores and
+                   dots appear in the preference name.
         title    - Field title in the preferences dialog
         description - Comments added to the preference file above the
                       preference value and shown as tooltip in the GUI, or NULL