diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index e91ee751727..8fbb5fd34ec 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -4053,10 +4053,11 @@ function dolGetFirstLastname($firstname,$lastname,$nameorder=-1)
 
 
 /**
- *	Set event message in dol_events session
+ *	Set event message in dol_events session object. Will be output by calling dol_htmloutput_events.
+ *  Note: Calling dol_htmloutput_events is done into pages by standard llxFooter() function.
  *
  *	@param	mixed	$mesgs			Message string or array
- *  @param  string	$style      	Which style to use ('mesgs', 'warnings', 'errors')
+ *  @param  string	$style      	Which style to use ('mesgs' by default, 'warnings', 'errors')
  *  @return	void
  *  @see	dol_htmloutput_events
  */
@@ -4078,6 +4079,8 @@ function setEventMessage($mesgs, $style='mesgs')
 
 /**
  *	Print formated messages to output (Used to show messages on html output).
+ *  Note: Calling dol_htmloutput_events is done into pages by standard llxFooter() function, so there is
+ *  no need to call it explicitely.
  *
  *  @return	void
  *  @see    dol_htmloutput_mesg