diff --git a/C4.puml b/C4.puml
index d19dcb2..eeb21eb 100644
--- a/C4.puml
+++ b/C4.puml
@@ -72,10 +72,10 @@ left to right direction
 ' ##################################
 
 !unquoted function Rel_($alias1, $alias2, $label, $direction="")
-$alias1 $direction $alias2 : $label
+$alias1 $direction $alias2 : **$label**
 !endfunction
 !unquoted function Rel_($alias1, $alias2, $label, $techn, $direction="")
-$alias1 $direction $alias2 : "$label\n//<size:$TECHN_FONT_SIZE>[$techn]</size>//"
+$alias1 $direction $alias2 : **$label**\n//<size:$TECHN_FONT_SIZE>[$techn]</size>//
 !endfunction
 
 !unquoted function Rel($from, $to, $label)