diff --git a/fhem/CHANGED b/fhem/CHANGED
index 354407810..67b2d75aa 100644
--- a/fhem/CHANGED
+++ b/fhem/CHANGED
@@ -461,3 +461,4 @@
   - feature: jsonlist command from Martin (contrib/JsonList)
   - feature: contrib/rotateShiftWork from Martin
   - feature: contrib/fhem2speech from Martin
+  - feature: attribute rainadjustment for KS300 (Boris 2008-12-17)
diff --git a/fhem/HISTORY b/fhem/HISTORY
index 7a9d0c453..f0eff2eae 100644
--- a/fhem/HISTORY
+++ b/fhem/HISTORY
@@ -355,3 +355,7 @@
     delete internal fhem commands. See 99_XmlList.pm for an example. Since this
     modules is called 99_xxx, it will be always loaded, but user of webpgm2 do
     not need it.
+
+- Wed Dec 17 19:48 (Boris)
+  - attribute rainadjustment for KS300 in 13_KS300.pm to account for random
+    switches in the rain counter (see commandref.html)
diff --git a/fhem/docs/commandref.html b/fhem/docs/commandref.html
index 29da299b8..6df1109ee 100644
--- a/fhem/docs/commandref.html
+++ b/fhem/docs/commandref.html
@@ -1889,6 +1889,12 @@ A line ending with \ will be concatenated with the next one, so long lines
     <li><a href="#showtime">showtime</a></li>
     <li><a href="#loglevel">loglevel</a></li>
     <li><a href="#model">model</a> (ks300)</li>
+    <li>rainadjustment<br>
+        If this attribute is set, fhem automatically accounts for rain counter
+        resets after a battery change and random counter switches as experienced
+        by some users. The raw rain counter values are adjusted by an offset
+        in order to flatten out the sudden large increases and decreases in
+        the received rain counter values. Default is off.</li>
   </ul>
   <br>
 
@@ -3201,7 +3207,7 @@ isday, sunrise_coord</pre>
   <ul>
     <code>define &lt;name&gt; FHEMRENDERER [global]</code>
 	    <br><br>
-        This defines a new "device", that is of type FHEMRENDERER. The option 'global' can be used if needed for sorting reasons. 
+        This defines a new "device", that is of type FHEMRENDERER. The option 'global' can be used if needed for sorting reasons.
         Otherwise this option has no real meaning for FHEMRENDERER.<br>
         <br>
         As a side-effect of defining this "device" the following attributes will be set for this "device":<br>
@@ -3211,7 +3217,7 @@ isday, sunrise_coord</pre>
 		&nbsp;&nbsp;room		Unsorted <br>
 		&nbsp;&nbsp;status		off <br>
 		&nbsp;&nbsp;tmpfile		/tmp/ <br>
-<br>    
+<br>
         NOTE: The Logfile will report (with LogLevel 2) that the FHEMRENDERER has been defined.
 
   </ul>