* Ensure Ocarina is in $PATH

doc/python.rst

@@ -12,6 +12,7 @@ run-time.
   support. Refer to the :ref:`installation`;
 * At run-time, the following environment variables must be set up::
 
+  * export PATH=`ocarina-config --prefix`/bin:$PATH
   % export OCARINA_PATH=`ocarina-config --prefix`
   % export LD_LIBRARY_PATH=$OCARINA_PATH/lib:$LD_LIBRARY_PATH
   % export PYTHONPATH=$OCARINA_PATH/include/ocarina/runtime/python:$OCARINA_PATH/lib:$PYTHONPATH