diff --git a/Documentation/Examples/cascade_example.cc b/Documentation/Examples/cascade_example.cc
index 6821e510c5b253198775bafecdd429d457636d83..cd40990858fc1f1798d294615ded0d2d52ec31c0 100644
--- a/Documentation/Examples/cascade_example.cc
+++ b/Documentation/Examples/cascade_example.cc
@@ -25,7 +25,6 @@
 
 #include <corsika/units/PhysicalUnits.h>
 
-//#include <corsika/units/PhysicalConstants.h>
 #include <corsika/units/PhysicalUnits.h>
 using namespace corsika;
 using namespace corsika::process;