diff --git a/ElectromagneticScattering/README.md b/ElectromagneticScattering/README.md
index 2fd79dd011cffae33b06e2db06ebfc1a24fd81ab..3d280ee5ae9f910e437d6b96128b503ac0caf450 100644
--- a/ElectromagneticScattering/README.md
+++ b/ElectromagneticScattering/README.md
@@ -12,7 +12,7 @@ This project contains a [Onelab](http://onelab.info/wiki/ONELAB) model for solvi
 
 This model requires the following (open-source) programs:
 * [onelab](http://onelab.info/wiki/ONELAB), which bundles both [gmsh](http://www.gmsh.info/) and [getdp](http://www.getdp.info/)
-* python (v2.7.x or v3.6.x)
+* python (v2.7.x or v3.6.x) with numpy, scipy, and matplotlib
 
 ## Running the model