diff --git a/htdocs/comm/action/index.php b/htdocs/comm/action/index.php
index 5e38198ab60..83cb7309c35 100644
--- a/htdocs/comm/action/index.php
+++ b/htdocs/comm/action/index.php
@@ -382,10 +382,10 @@ if ($resql)
         $event->type_code=$obj->code;
         $event->libelle=$obj->label;
         $event->percentage=$obj->percent;
-        $event->author->id=$obj->fk_user_author;
-        $event->usertodo->id=$obj->fk_user_action;
-        $event->userdone->id=$obj->fk_user_done;
-
+        $event->author->id=$obj->fk_user_author;	// user id of creator
+        $event->usertodo->id=$obj->fk_user_action;	// user id of owner
+        $event->userdone->id=$obj->fk_user_done;	// deprecated
+		// $event->userstodo=... with s after user, in future version, will be an array with all id of user assigned to event
         $event->priority=$obj->priority;
         $event->fulldayevent=$obj->fulldayevent;
         $event->location=$obj->location;
@@ -1009,6 +1009,11 @@ function show_day_events($db, $day, $month, $year, $monthshown, $style, &$eventa
                     || (! empty($event->userdone->id) && $event->userdone->id == $user->id))
                     {
                     	$nummytasks++; $cssclass='family_mytasks';
+                    	// TODO Set a color using user color
+                    	// Must defined rule to choose color of who to use.
+                    	// event->usertodo->id will still contains user id of owner
+                    	// event->userstodo will be an array in future.
+                    	// $color=$user->color; 
                     }
                     else if ($event->type_code == 'ICALEVENT')
                     {
diff --git a/htdocs/install/mysql/tables/llx_actioncomm.sql b/htdocs/install/mysql/tables/llx_actioncomm.sql
index 275abc53370..ea70aa02385 100644
--- a/htdocs/install/mysql/tables/llx_actioncomm.sql
+++ b/htdocs/install/mysql/tables/llx_actioncomm.sql
@@ -32,21 +32,23 @@ create table llx_actioncomm
 
   fk_action			integer,						-- type of action (optionnal link with llx_c_actioncomm or null)
   code				varchar(32) NULL,				-- code of action for automatic action
-  label				varchar(128) NOT NULL,			-- libelle de l'action
+  label				varchar(128) NOT NULL,			-- label/title of event
   
   datec				datetime,						-- date creation
-  tms				timestamp,						-- date modif
-  fk_user_author	integer,						-- id user qui a cree l'action
-  fk_user_mod		integer,						-- id dernier user qui a modifier l'action
+  tms				timestamp,						-- date modification
+  fk_user_author	integer,						-- user id of user that has created record
+  fk_user_mod		integer,						-- user id of user that has modified record
 
   fk_project		integer,
   fk_soc			integer,
   fk_contact		integer,
   fk_parent			integer NOT NULL default 0,
 
-  fk_user_action	integer,						-- id de la personne qui doit effectuer l'action
-  transparency      integer,						-- transparency (ical standard). used to say if people assigned to event are busy or not by event.
-  fk_user_done		integer,						-- id de la personne qui a effectue l'action
+  fk_user_action	integer,						-- user id of owner of action (currently also user id of actor that must do action. In future, actors assigned to action will be an array into table llx_actioncomm_actors)
+
+  transparency      integer,						-- transparency (ical standard). used to say if people assigned to event are busy or not by event (in future version, this field is deprecated and will be stored into table llx_actioncomm_actors)
+  fk_user_done		integer,						-- user id of people that has made action (deprecated)
+  
   priority			smallint,
   fulldayevent		smallint NOT NULL default 0,
   punctual			smallint NOT NULL default 1,