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-rw-r--r--Documentation/public-inbox-config.pod5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/public-inbox-config.pod b/Documentation/public-inbox-config.pod
index 1ef7f46f..d394d31f 100644
--- a/Documentation/public-inbox-config.pod
+++ b/Documentation/public-inbox-config.pod
@@ -74,6 +74,11 @@ Omitting this for a given inbox will prevent the inbox from
 being served by L<public-inbox-nntpd(1)>,
 L<public-inbox-imapd(1)>, and/or L<public-inbox-pop3d(1)>
 
+Newsgroup names should be all lowercase.  Uppercase characters are
+converted to lowercase for compatibility with IMAP, POP3, and our
+L<public-inbox-extindex(1)> and L<public-inbox-cindex(1)> tools
+starting with public-inbox 2.0+ (they were unusable before).
+
 Default: none, optional
 
 =item publicinbox.<name>.watch