diff --git a/plantuml/class-diagram-tips.md b/plantuml/class-diagram-tips.md
index 1845751..41cce2c 100644
--- a/plantuml/class-diagram-tips.md
+++ b/plantuml/class-diagram-tips.md
@@ -120,9 +120,3 @@
 
     ' allow polylines
     skinparam linetype polyline
-
-## Sequence diagram coloring
-
-You can change the colors of the arrows and messages as followings:
-
-a -[#red]> b : <color blue> some message</color>