diff --git a/README.md b/README.md
index 65cc94e..7bf9d41 100644
--- a/README.md
+++ b/README.md
@@ -83,9 +83,9 @@ sbgraph fetch
 
 To fetch from a private project, you needs to set the cookie to environment variables.
 
-```bash
-$ export SB_COOKIE_ID=connect.sid
-$ export SB_COOKIE_VALUE=your-fancy-cookie
+```
+export SB_COOKIE_ID=connect.sid
+export SB_COOKIE_VALUE=your-fancy-cookie
 ```
 
 ### Aggregate user activites in the project
@@ -129,9 +129,26 @@ sbgraph graph -t 100
 
 Graphviz dot file will be created at `<WorkDir>/<project name>.dot`.
 
+
+To generate graph data as JSON, specify -j(--json) flag.
+
+```
+sbgraph graph -j=true
+```
+
+To generate graph Image as SVG format, specify -m(--image) flag.
+
+```
+sbgraph graph -m=true
+```
+
+Graphviz needs to be installed. You can not specify layout engine.
+
 ### Visualize with Graphviz
 
-You can generate graph image with dot command. e.g.
+You can generate SVG with graph sub command, but to specify more options such as layout engine, you can use dot command directly.
+
+e.g.
 
 ```
 dot <project name>.dot -Tsvg -Kfdp -Goverlap=prism -<project name>.svg
diff --git a/cmd/graph.go b/cmd/graph.go
index 2923e3c..c86f8b3 100644
--- a/cmd/graph.go
+++ b/cmd/graph.go
@@ -60,6 +60,7 @@ func init() {
 	graphCmd.PersistentFlags().BoolP("include", "i", false, "Include user node")
 	graphCmd.PersistentFlags().BoolP("anonymize", "a", false, "Anonymize user")
 	graphCmd.PersistentFlags().BoolP("json", "j", false, "Output as JSON format")
+	graphCmd.PersistentFlags().BoolP("image", "m", false, "Output SVG image")
 
 	rootCmd.AddCommand(graphCmd)
 }
@@ -70,8 +71,10 @@ func buildGraph(cmd *cobra.Command) {
 	threshold, _ := cmd.PersistentFlags().GetInt("threshold")
 	includeUser, _ := cmd.PersistentFlags().GetBool("include")
 	anonymize, _ := cmd.PersistentFlags().GetBool("anonymize")
-	oJson, _ := cmd.PersistentFlags().GetBool("json")
-	fmt.Printf("Build graph project : %s, threshold : %d, include user: %t, anonymize : %t, json : %t\n", projectName, threshold, includeUser, anonymize, oJson)
+	oJSON, _ := cmd.PersistentFlags().GetBool("json")
+	oSVG, _ := cmd.PersistentFlags().GetBool("image")
+
+	fmt.Printf("Build graph project : %s, threshold : %d, include user: %t, anonymize : %t, json : %t, svg : %t\n", projectName, threshold, includeUser, anonymize, oJSON, oSVG)
 	var proj types.Project
 	err := proj.ReadFrom(projectName, config.WorkDir)
 	CheckErr(err)
@@ -151,11 +154,15 @@ func buildGraph(cmd *cobra.Command) {
 	}
 	err = writeDot(graph, projectName, config.WorkDir)
 	CheckErr(err)
-	if oJson {
+	if oJSON {
 		data, _ := json.Marshal(pGraph)
 		err = file.WriteBytes(data, projectName+"_graph.json", config.WorkDir)
 		CheckErr(err)
 	}
+	if oSVG {
+		err = writeSvg(graph, projectName, config.WorkDir)
+		CheckErr(err)
+	}
 }
 
 func createGraph() graphviz.Graph {
@@ -185,3 +192,8 @@ func writeDot(graph graphviz.Graph, projectName string, workDir string) error {
 	graph.GenerateDOT(file)
 	return nil
 }
+
+func writeSvg(graph graphviz.Graph, projectName string, workDir string) error {
+	path := fmt.Sprintf("%s/%s.svg", workDir, projectName)
+	return graph.GenerateImage("dot", path, "svg")
+}