diff --git a/Documentation/email-clients.txt b/Documentation/email-clients.txt
index 945ff3f..fb12c22 100644
--- a/Documentation/email-clients.txt
+++ b/Documentation/email-clients.txt
@@ -104,6 +104,13 @@
 As an added bonus you can customise the message creation toolbar menu
 and put the "insert file" icon there.
 
+Make the the composer window wide enough so that no lines wrap. As of
+KMail 1.13.5 (KDE 4.5.4), KMail will apply word wrapping when sending
+the email if the lines wrap in the composer window. Having word wrapping
+disabled in the Options menu isn't enough. Thus, if your patch has very
+long lines, you must make the composer window very wide before sending
+the email. See: https://bugs.kde.org/show_bug.cgi?id=174034
+
 You can safely GPG sign attachments, but inlined text is preferred for
 patches so do not GPG sign them.  Signing patches that have been inserted
 as inlined text will make them tricky to extract from their 7-bit encoding.