diff --git a/htdocs/theme/auguria/style.css.php b/htdocs/theme/auguria/style.css.php
index 78bdafc3e0d..a3b5150bb57 100644
--- a/htdocs/theme/auguria/style.css.php
+++ b/htdocs/theme/auguria/style.css.php
@@ -423,7 +423,7 @@ foreach($mainmenuusedarray as $val)
 	}
 	if ($found)
 	{
-		print "/* A mainmenu entry but img file ".$val.".png not found, so we use a generic one */\n";
+		print "/* A mainmenu entry but img file ".$val.".png not found (check /".$val."/img/".$val.".png), so we use a generic one */\n";
 		print "div.mainmenu.".$val." {\n";
 		print "	background-image: url(".$url.");\n";
 		print "	height:28px;\n";
diff --git a/htdocs/theme/bureau2crea/style.css.php b/htdocs/theme/bureau2crea/style.css.php
index 5c367ffb798..00bb6e62a14 100644
--- a/htdocs/theme/bureau2crea/style.css.php
+++ b/htdocs/theme/bureau2crea/style.css.php
@@ -462,7 +462,7 @@ foreach($mainmenuusedarray as $val)
 	}
 	if ($found)
 	{
-		print "/* A mainmenu entry but img file ".$val.".png not found, so we use a generic one */\n";
+		print "/* A mainmenu entry but img file ".$val.".png not found (check /".$val."/img/".$val.".png), so we use a generic one */\n";
 		print "div.mainmenu.".$val." {\n";
 		print "	background-image: url(".$url.");\n";
 		print "	height:28px;\n";
diff --git a/htdocs/theme/cameleo/style.css.php b/htdocs/theme/cameleo/style.css.php
index 5ac4a4cbb1c..ff6e3696d33 100644
--- a/htdocs/theme/cameleo/style.css.php
+++ b/htdocs/theme/cameleo/style.css.php
@@ -599,7 +599,7 @@ foreach($mainmenuusedarray as $val)
 	}
 	if ($url)
 	{
-		print "/* A mainmenu entry but img file ".$val.".png not found, so we use a generic one */\n";
+		print "/* A mainmenu entry but img file ".$val.".png not found (check /".$val."/img/".$val.".png), so we use a generic one */\n";
 		print "div.mainmenu.".$val." {\n";
 		print "	background-image: url(".$url.");\n";
 		print "	height:28px;\n";
diff --git a/htdocs/theme/eldy/style.css.php b/htdocs/theme/eldy/style.css.php
index 63eea66a591..2f2622cd9c1 100644
--- a/htdocs/theme/eldy/style.css.php
+++ b/htdocs/theme/eldy/style.css.php
@@ -785,7 +785,7 @@ foreach($mainmenuusedarray as $val)
 		$url=dol_buildpath($path.'/theme/'.$theme.'/img/menus/generic'.$generic.".png",1);
 		$found=1;
 		if ($generic < 4) $generic++;
-		print "/* A mainmenu entry but img file ".$val.".png not found, so we use a generic one */\n";
+		print "/* A mainmenu entry but img file ".$val.".png not found (check /".$val."/img/".$val.".png), so we use a generic one */\n";
 	}
 	if ($found)
 	{