diff --git a/KLayout-Python-Module.md b/KLayout-Python-Module.md
index 38a1fcb..ad888c7 100644
--- a/KLayout-Python-Module.md
+++ b/KLayout-Python-Module.md
@@ -9,6 +9,23 @@ Auto-generated documentation for the Functions is here:
  * ```klayout.db``` module: [http://www.klayout.org/downloads/master/doc-qt4/code/module_db.html](http://www.klayout.org/downloads/pymod/doc-qt4/code/module_db.html)
  * ```klayout.rdb``` module: [http://www.klayout.org/downloads/master/doc-qt4/code/module_rdb.html](http://www.klayout.org/downloads/pymod/doc-qt4/code/module_rdb.html)
 
+## Using the Python package on Windows
+
+The Python package (either from PyPI or https://www.klayout.org/downloads/master/) needs some 3rd party libraries to be functional:
+
+1.) Download the 3rd party package from https://www.klayout.org/downloads/klayout-bits-1.0.zip
+
+2.) Unzip (e.g. under ```c:\klayout-bits-1.0```)
+
+3.) Install klayout package (here: from PyPI)
+
+```pip install klayout```
+
+4.) Add the 3rd-party packages to the path (sorry, lengthy):
+
+```
+set PATH=C:\klayout-bits-1.0\msvc2017\x64\curl\bin;c:\klayout-bits-1.0\msvc2017\x64\expat\bin;c:\klayout-bits-1.0\msvc2017\x64\ptw\bin;c:\klayout-bits-1.0\msvc2017\x64\zlib\bin;%PATH%
+```
 ## Building with ```setuptools```
 
 ```