Update README.md

607011 · May 27, 2016 · abc672e · abc672e
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@@ -89,3 +89,13 @@ flippy.py
 
 `FPS`: convert video/GIF to this many frames per second before PDF generation (default: 10 fps)
 
+
+### Missing something
+
+If you're experiencing errors like "command not found" call flippy.py with
+
+```
+D:\Python27\python.exe flippy.py ...
+```
+
+if Python is installed in D:\Python27