diff -r 5e83c70266cf -r 8882fc8005ad doc-src/IsarImplementation/Integration.thy
--- a/doc-src/IsarImplementation/Integration.thy	Tue Aug 28 15:07:43 2012 +0200
+++ b/doc-src/IsarImplementation/Integration.thy	Tue Aug 28 16:33:06 2012 +0200
@@ -6,7 +6,7 @@
 
 section {* Isar toplevel \label{sec:isar-toplevel} *}
 
-text {* The Isar toplevel may be considered the centeral hub of the
+text {* The Isar toplevel may be considered the central hub of the
   Isabelle/Isar system, where all key components and sub-systems are
   integrated into a single read-eval-print loop of Isar commands,
   which also incorporates the underlying ML compiler.