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diff --git a/src/cython/doc/installation.rst b/src/cython/doc/installation.rst
index c182f176..28d9dba2 100644
--- a/src/cython/doc/installation.rst
+++ b/src/cython/doc/installation.rst
@@ -43,6 +43,9 @@ following command in a terminal:
export PYTHONPATH='$PYTHONPATH:/path-to-gudhi/build/cython'
ctest -R py_test
+If tests fail, please try to :code:`import gudhi` and check the errors.
+The problem can come from a third-party library bad link or installation.
+
Documentation
=============