diff --git a/docs/Developer.md b/docs/Developer.md
new file mode 100644
index 0000000..668b15c
--- /dev/null
+++ b/docs/Developer.md
@@ -0,0 +1,17 @@
+
+## Flow chart
+
+![FlowChart](drawio/FlowChart.svg)
+
+
+- Use [drawio](https://app.diagrams.net/) to edit.
+
+1. Open [drawio](https://app.diagrams.net/) in brower
+2. Menu → File → Open from ... → Device:
+
+Select [FlowChart.html](FlowChart.html)
+
+3. Edit flow chart
+4. Export to svg:
+
+Menu → File → Export as... → SVG...
diff --git a/docs/drawio/FlowChart.html b/docs/drawio/FlowChart.html
new file mode 100644
index 0000000..a84fbda
--- /dev/null
+++ b/docs/drawio/FlowChart.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<title>draw.io</title>
+<meta http-equiv="refresh" content="0;URL='https://app.diagrams.net/#HKangLin%2Fcoturn%2FFlowChart%2Fdocs%2Fdrawio%2FFlowChart.html'"/>
+<meta charset="utf-8"/>
+</head>
+<body>
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