2 files changed, 10 insertions, 6 deletions

diff --git a/doc/guide.html b/doc/guide.html
index 23a4703d9..b94c65959 100644
--- a/doc/guide.html
+++ b/doc/guide.html
@@ -1922,9 +1922,11 @@ allowed to modify the ’persistent’ chatroom option
 </DD><DT CLASS="dt-description"><B><TT>access_admin</TT></B></DT><DD CLASS="dd-description"> This option specifies
 who is allowed to administrate the Multi-User Chat service (the default
 value is <TT>none</TT>, which means that only the room creator can
-administer his room). By sending a message to the service JID,
-administrators can send service messages that will be displayed in every
-active room.
+administer his room).
+The administrators can send a normal message to the service JID,
+and it will be shown in every active room as a service message.
+The administrators can send a groupchat message to the JID of an active room,
+and the message will be shown in the room as a service message.
 </DD><DT CLASS="dt-description"><B><TT>history_size</TT></B></DT><DD CLASS="dd-description"> A small history of
 the current discussion is sent to users when they enter the
 room. With this option you can define the number of history messages
diff --git a/doc/guide.tex b/doc/guide.tex
index 7612c9a29..73d889fc5 100644
--- a/doc/guide.tex
+++ b/doc/guide.tex
@@ -2522,9 +2522,11 @@ Module options:
 \titem{access\_admin} \ind{options!access\_admin}This option specifies
   who is allowed to administrate the Multi-User Chat service (the default
   value is \term{none}, which means that only the room creator can
-  administer his room). By sending a message to the service JID,
-  administrators can send service messages that will be displayed in every
-  active room.
+  administer his room).
+  The administrators can send a normal message to the service JID,
+  and it will be shown in every active room as a service message.
+  The administrators can send a groupchat message to the JID of an active room,
+  and the message will be shown in the room as a service message.
 \titem{history\_size} \ind{options!history\_size}A small history of
   the current discussion is sent to users when they enter the
   room. With this option you can define the number of history messages