diff --git a/docs/Developer.md b/docs/Developer.md
index 668b15ca..052b5eeb 100644
--- a/docs/Developer.md
+++ b/docs/Developer.md
@@ -1,17 +1,20 @@
 
-## Flow chart
+## Developer
+
+### Flow chart
 
 ![FlowChart](drawio/FlowChart.svg)
 
-
+### Edit flow chart
 - 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)
+   Select [FlowChart.html](drawio/FlowChart.html)
 
 3. Edit flow chart
 4. Export to svg:
 
-Menu → File → Export as... → SVG...
+   Menu → File → Export as... → SVG...
+
diff --git a/docs/drawio/FlowChart.png b/docs/drawio/FlowChart.png
deleted file mode 100644
index 865d0857..00000000
Binary files a/docs/drawio/FlowChart.png and /dev/null differ
diff --git a/docs/drawio/FlowChart.svg b/docs/drawio/FlowChart.svg
index 65550a47..0ab05f61 100644
--- a/docs/drawio/FlowChart.svg
+++ b/docs/drawio/FlowChart.svg
@@ -1,4 +1,4 @@
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