diff --git a/interfaces/cython/cantera/examples/reactors/ic_engine.py b/interfaces/cython/cantera/examples/reactors/ic_engine.py
index bee0e63f1..2840cdd35 100644
--- a/interfaces/cython/cantera/examples/reactors/ic_engine.py
+++ b/interfaces/cython/cantera/examples/reactors/ic_engine.py
@@ -5,6 +5,8 @@ Simulation of a (gaseous) Diesel-type internal combustion engine.
 The simulation uses n-Dodecane as fuel, which is injected close to top dead
 center. Note that this example uses numerous simplifying assumptions and
 thus serves for illustration purposes only.
+
+Requires: Cantera >= 2.5.0, scipy >= 0.19, matplotlib >= 2.0
 """
 
 import cantera as ct