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diff --git a/tools/readme-esptool-win.txt b/tools/readme-esptool-win.txt
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+Hwo to build the bundled esp tool for windows
+=============================================
+(1) install python 3 on windows, add to path
+(2) pip install pyinstaller
+(3) create an empty dir, cd there
+(4) get esptool.py (either pip install esptool, search for it or download from 
+    https://github.com/espressif/esptool - just esptool.py)
+(5) run: pyinstaller -F esptool.py
+    esptool.exe in dist\esptool
+