diff --git a/UtilityApps/src/test_surfaces.cpp b/UtilityApps/src/test_surfaces.cpp
index b1fc60e810d2dd61c7ebaf054475c6fcb6202632..1ebc3af96216777175892de261a867552cae49cd 100644
--- a/UtilityApps/src/test_surfaces.cpp
+++ b/UtilityApps/src/test_surfaces.cpp
@@ -169,7 +169,7 @@ int main(int argc, char** argv ){
                       << " id : " << idDecoder.valueString() 
                       << " point : " << point 
                       << " is inside : " <<  isInside
-                      << " distance from surface : " << dist/dd4hep::mm << std::endl 
+                      << " distance from surface : " << dist  << "  (units: cm) " << std::endl 
                       << std::endl ;
           }