diff --git a/README.md b/README.md
index 1afed09..4fc07b6 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,22 @@
-# ddd-sample-in-golang
+# DDD sample
 
-ddd sample
+
+### cargo
+
+DDD sample with OO
+
+## counting shapes
+
+DDD sample with FP
+
+![](shapes.png)
+
+### counting triangles
+How many triangles can you see?
+24, details as follows:
+[abc abd abe acd ace ade aef aeg aeh afg afh agh ahi ahj ahk aij aik ajk beh ceg def ehk fhj ghi]
+
+### counting quadrangles
+How many quadrangles can you see?
+18, details as follows:
+[aceh adeg adeh afhk aghj aghk bcgh bcih bdfh bdjh bekh cdfg cdji ceki dekj efjk egik fgij]
diff --git a/counting-shapes/domain/service/counting_shapes.go b/counting-shapes/domain/service/counting_shapes.go
index 7184c3f..f223dde 100644
--- a/counting-shapes/domain/service/counting_shapes.go
+++ b/counting-shapes/domain/service/counting_shapes.go
@@ -3,6 +3,7 @@ package service
 import (
     "github.com/agiledragon/ddd-sample-in-golang/counting-shapes/domain/model"
    // "fmt"
+    "fmt"
 )
 
 func CountingTriangles(points model.Points, lines []model.Line) []model.Points {
@@ -13,7 +14,7 @@ func CountingTriangles(points model.Points, lines []model.Line) []model.Points {
             matches = append(matches, set)
         }
     }
-    //fmt.Println("matches:", matches)
+    fmt.Println("matches:", matches)
     return matches
 }
 
diff --git a/shapes.png b/shapes.png
new file mode 100644
index 0000000..79b742e
Binary files /dev/null and b/shapes.png differ