diff --git a/Changes b/Changes
index 04ed4c7c9..5ec082170 100644
--- a/Changes
+++ b/Changes
@@ -2152,3 +2152,4 @@
   Josh. (#3950)
 - Fixed braindamage in stacked bans.
 - Add m_nopost to makefile.win32 in the hopes that it may work (#3961).
+- Document spamfilter 'warn' action in unreal32docs.
diff --git a/doc/unreal32docs.html b/doc/unreal32docs.html
index 6a9aab6a8..857907b0f 100644
--- a/doc/unreal32docs.html
+++ b/doc/unreal32docs.html
@@ -552,6 +552,9 @@ Modules can add other extended ban types.<br>
 <tr><td>dccblock</td><td>mark the user so (s)he's unable to send any DCCs</td></tr>
 <tr valign="top"><td>viruschan</td><td>part all channels, join set::spamfilter::virus-help-channel, disables all commands 
  except PONG, ADMIN, and msg/notices to set::spamfilter::virus-help-channel</td></tr>
+<tr><td>warn</td><td>send a notice to IRCOps (spamfilter snomask), and
+ inform the user that the message has been intercepted. No further action is
+taken, the message is not blocked.</td></tr>
 </table></tr></td>
    <tr valign="top"><td><b>[tkltime]</b></td><td> The duration of the *line/shun added by the filter, use '-' to use the default or to skip 
    (eg: if action = 'block')</td></tr>