sect4 -> sect3

diff --git a/examples/step-63/step-63.cc b/examples/step-63/step-63.cc
index 977cabe30fce559264a55180a854205e6548b70b..3cfcea97021fcd8b9371e0c9af8d6fe44ff2a84a 100644 (file)
--- a/examples/step-63/step-63.cc
+++ b/examples/step-63/step-63.cc
@@ -1223,7 +1223,7 @@ namespace Step63
 } // namespace Step63
 
 
-// @sect4{The <code>main</code> function}
+// @sect3{The <code>main</code> function}
 
 // Finally, the main function is like most tutorials. The only
 // interesting bit is that we require the user to pass a `.prm` file