Minor doc improvement in step-6.

diff --git a/examples/step-6/step-6.cc b/examples/step-6/step-6.cc
index 682008eb7264e11c0e17bd485bfb4744fdfcec35..12ed4257822e2271060e539f03badb91f7ede716 100644 (file)
--- a/examples/step-6/step-6.cc
+++ b/examples/step-6/step-6.cc
@@ -45,7 +45,7 @@
 #include <fstream>
 
 // From the following include file we will import the declaration of
-// H1-conforming finite element shape functions. This family of finite
+// $H^1$-conforming finite element shape functions. This family of finite
 // elements is called <code>FE_Q</code>, and was used in all examples before
 // already to define the usual bi- or tri-linear elements, but we will now use
 // it for bi-quadratic elements: