diff --git a/python/test_unit/eigenpy.py b/python/test_unit/test_eigenpy.py
similarity index 100%
rename from python/test_unit/eigenpy.py
rename to python/test_unit/test_eigenpy.py
diff --git a/python/test_unit/geometry.py b/python/test_unit/test_geometry.py
similarity index 100%
rename from python/test_unit/geometry.py
rename to python/test_unit/test_geometry.py
diff --git a/src/quaternion.hpp b/src/quaternion.hpp
index e0f01fc25671cd91b28be628c5d162d2d068e59e..279bdeac1e9298204e11d49ff3539e257557b615 100644
--- a/src/quaternion.hpp
+++ b/src/quaternion.hpp
@@ -60,6 +60,7 @@ namespace eigenpy
 
   public:
 
+    /* Conversion from C++ to Python. */
     static PyObject* convert(Quaternion const& q)
     {
       QuaternionUnaligned qx = q;