diff --git a/docs/conf.py b/docs/conf.py
index c5cc8286b1a67c120cfae2ab0f18dd305d9cab75..5dab84480a28d0cb1121e2c316c4763ebfd1fcf6 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -269,4 +269,6 @@ intersphinx_mapping = {
     'sklearn': ('http://scikit-learn.org/stable', None),
     'pandas': ('http://pandas.pydata.org/pandas-docs/stable', None),
     'scipy': ('https://docs.scipy.org/doc/scipy/reference', None),
+    'sympy': ('https://docs.sympy.org/latest/', None),
+    'pystencils': ('http://pycodegen.pages.walberla.net/pystencils/', None),
 }