diff --git a/requirements.txt b/requirements.txt
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+# This file contains python only requirements to be installed with pip
+# Python pacakges that cannot be installed with pip (e.g. PyQT4) are not included.
+# Usage: pip install -r requirements.txt
+numpy>=1.8
+matplotlib>=1.3.1
+shapely>=1.3
+simplejson
+rtree
+scipy