1.1 --- a/src/HOL/Number_Theory/Cong.thy	Sun Nov 02 18:21:14 2014 +0100
     1.2 +++ b/src/HOL/Number_Theory/Cong.thy	Sun Nov 02 18:21:45 2014 +0100
     1.3 @@ -23,7 +23,7 @@
     1.4  natural numbers and the integers, and added a number of new theorems.
     1.5  *)
     1.6  
     1.7 -header {* Congruence *}
     1.8 +section {* Congruence *}
     1.9  
    1.10  theory Cong
    1.11  imports Primes