modules_k/uac: document RR append_fromtag requirement in auto mode

modules_k/uac/README

@@ -236,7 +236,8 @@ modparam("uac","rr_to_store_param","my_param")
        sequential requests - this must be manually updated based on
        original URI.
      * “auto” - all sequential requests and replies will be automatically
-       updated based on stored original URI.
+       updated based on stored original URI. For this option you have to
+       set “modparam("rr", "append_fromtag", 1)”.
 
    This parameter is optional, it's default value being “auto”.
 

modules_k/uac/doc/uac_admin.xml

@@ -166,7 +166,8 @@ modparam("uac","rr_to_store_param","my_param")
 			<listitem>
 				<para>
 				<quote>auto</quote> - all sequential requests and replies will 
-				be automatically updated based on stored original URI.
+				be automatically updated based on stored original URI. For this
+				option you have to set <quote>modparam("rr", "append_fromtag", 1)</quote>.
 				</para>
 			</listitem>
 			</itemizedlist>