--- a/doc-src/IsarRef/Thy/First_Order_Logic.thy	Thu Sep 29 09:37:59 2011 +0200
+++ b/doc-src/IsarRef/Thy/First_Order_Logic.thy	Mon Oct 03 11:14:19 2011 +0200
@@ -47,7 +47,7 @@
 text {*
   \noindent Substitution is very powerful, but also hard to control in
   full generality.  We derive some common symmetry~/ transitivity
-  schemes of as particular consequences.
+  schemes of @{term equal} as particular consequences.
 *}
 
 theorem sym [sym]: