diff --git a/output/dot/dot.go b/output/dot/dot.go
index 9c086720..b2a34418 100644
--- a/output/dot/dot.go
+++ b/output/dot/dot.go
@@ -36,14 +36,18 @@ func OutputTable(wr io.Writer, t *schema.Table) error {
 				encountered[r.ParentTable.Name] = true
 				tables = append(tables, r.ParentTable)
 			}
-			relations = append(relations, r)
+			if !contains(relations, r) {
+				relations = append(relations, r)
+			}
 		}
 		for _, r := range c.ChildRelations {
 			if !encountered[r.Table.Name] {
 				encountered[r.Table.Name] = true
 				tables = append(tables, r.Table)
 			}
-			relations = append(relations, r)
+			if !contains(relations, r) {
+				relations = append(relations, r)
+			}
 		}
 	}
 
@@ -61,3 +65,12 @@ func OutputTable(wr io.Writer, t *schema.Table) error {
 
 	return nil
 }
+
+func contains(rs []*schema.Relation, e *schema.Relation) bool {
+	for _, r := range rs {
+		if e == r {
+			return true
+		}
+	}
+	return false
+}
diff --git a/output/md/templates.go b/output/md/templates.go
index 4640fc03..d78d92c8 100644
--- a/output/md/templates.go
+++ b/output/md/templates.go
@@ -6,17 +6,12 @@ import (
 	"github.com/jessevdk/go-assets"
 )
 
-var _Assets43889384df1c6f74d764c29d91b9d5637eb46061 = "# {{ .Schema.Name }}\n\n## Tables\n{{ range $t := .Tables }}\n|{{ range $d := $t }} {{ $d | nl2br }} |{{ end }}\n{{- end }}\n\n{{ if .er -}}\n## Relations\n\n![er](schema.png)\n{{- end }}\n\n---\n\n> Generated by [tbls](https://github.com/k1LoW/tbls)"
 var _Assetsac44302fb6150a621aa9d04a0350aac972bf7e18 = "# {{ .Table.Name }}\n\n## Description\n\n{{ .Table.Comment | nl2mdnl -}}\n{{ if .Table.Def }}\n<details>\n<summary><strong>Table Definition</strong></summary>\n\n```sql\n{{ .Table.Def }}\n```\n\n</details>\n{{ end }}\n\n## Columns\n{{ range $l := .Columns }}\n|{{ range $d := $l }} {{ $d | nl2br }} |{{ end }}\n{{- end }}\n\n{{ $len := len .Constraints }}{{ if ne $len 2 -}}\n## Constraints\n{{ range $l := .Constraints }}\n|{{ range $d := $l }} {{ $d | nl2br }} |{{ end }}\n{{- end }}\n{{- end }}\n\n{{ $len := len .Indexes -}}{{ if ne $len 2 -}}\n## Indexes\n{{ range $l := .Indexes }}\n|{{ range $d := $l }} {{ $d | nl2br }} |{{ end }}\n{{- end }}\n{{- end }}\n\n{{ $len := len .Triggers -}}{{ if ne $len 2 -}}\n## Triggers\n{{ range $l := .Triggers }}\n|{{ range $d := $l }} {{ $d | nl2br }} |{{ end }}\n{{- end }}\n{{- end }}\n\n{{ if .er -}}\n## Relations\n\n![er]({{ .Table.Name }}.png)\n{{- end }}\n\n---\n\n> Generated by [tbls](https://github.com/k1LoW/tbls)"
+var _Assets43889384df1c6f74d764c29d91b9d5637eb46061 = "# {{ .Schema.Name }}\n\n## Tables\n{{ range $t := .Tables }}\n|{{ range $d := $t }} {{ $d | nl2br }} |{{ end }}\n{{- end }}\n\n{{ if .er -}}\n## Relations\n\n![er](schema.png)\n{{- end }}\n\n---\n\n> Generated by [tbls](https://github.com/k1LoW/tbls)"
 
 // Assets returns go-assets FileSystem
 var Assets = assets.NewFileSystem(map[string][]string{"/": []string{"index.md.tmpl", "table.md.tmpl"}}, map[string]*assets.File{
-	"/table.md.tmpl": &assets.File{
-		Path:     "/table.md.tmpl",
-		FileMode: 0x1a4,
-		Mtime:    time.Unix(1532785399, 1532785399000000000),
-		Data:     []byte(_Assetsac44302fb6150a621aa9d04a0350aac972bf7e18),
-	}, "/": &assets.File{
+	"/": &assets.File{
 		Path:     "/",
 		FileMode: 0x800001ed,
 		Mtime:    time.Unix(1532785399, 1532785399000000000),
@@ -26,4 +21,9 @@ var Assets = assets.NewFileSystem(map[string][]string{"/": []string{"index.md.tm
 		FileMode: 0x1a4,
 		Mtime:    time.Unix(1532239511, 1532239511000000000),
 		Data:     []byte(_Assets43889384df1c6f74d764c29d91b9d5637eb46061),
+	}, "/table.md.tmpl": &assets.File{
+		Path:     "/table.md.tmpl",
+		FileMode: 0x1a4,
+		Mtime:    time.Unix(1532785399, 1532785399000000000),
+		Data:     []byte(_Assetsac44302fb6150a621aa9d04a0350aac972bf7e18),
 	}}, "")
diff --git a/sample/adjust/comment_stars.png b/sample/adjust/comment_stars.png
index c8cbc973..deb85b72 100644
Binary files a/sample/adjust/comment_stars.png and b/sample/adjust/comment_stars.png differ
diff --git a/sample/adjust/comments.png b/sample/adjust/comments.png
index d3004ba0..159e6c44 100644
Binary files a/sample/adjust/comments.png and b/sample/adjust/comments.png differ
diff --git a/sample/mysql/comment_stars.png b/sample/mysql/comment_stars.png
index 68c9e74b..420a6bf2 100644
Binary files a/sample/mysql/comment_stars.png and b/sample/mysql/comment_stars.png differ
diff --git a/sample/mysql/comments.png b/sample/mysql/comments.png
index 6bc733d8..2d2b1cd9 100644
Binary files a/sample/mysql/comments.png and b/sample/mysql/comments.png differ
diff --git a/sample/mysql8/comment_stars.png b/sample/mysql8/comment_stars.png
index 68c9e74b..420a6bf2 100644
Binary files a/sample/mysql8/comment_stars.png and b/sample/mysql8/comment_stars.png differ
diff --git a/sample/mysql8/comments.png b/sample/mysql8/comments.png
index 6bc733d8..2d2b1cd9 100644
Binary files a/sample/mysql8/comments.png and b/sample/mysql8/comments.png differ
diff --git a/sample/postgres/comment_stars.png b/sample/postgres/comment_stars.png
index c8cbc973..deb85b72 100644
Binary files a/sample/postgres/comment_stars.png and b/sample/postgres/comment_stars.png differ
diff --git a/sample/postgres/comments.png b/sample/postgres/comments.png
index d3004ba0..159e6c44 100644
Binary files a/sample/postgres/comments.png and b/sample/postgres/comments.png differ
diff --git a/sample/sqlite/comment_stars.png b/sample/sqlite/comment_stars.png
index 3b2316a2..61f6e38b 100644
Binary files a/sample/sqlite/comment_stars.png and b/sample/sqlite/comment_stars.png differ
diff --git a/sample/sqlite/comments.png b/sample/sqlite/comments.png
index 1d9482b3..555ef101 100644
Binary files a/sample/sqlite/comments.png and b/sample/sqlite/comments.png differ