--- a/doc-src/IsarRef/Thy/ZF_Specific.thy Tue May 03 14:23:40 2011 +0200
+++ b/doc-src/IsarRef/Thy/ZF_Specific.thy Tue May 03 15:07:36 2011 +0200
@@ -1,5 +1,5 @@
theory ZF_Specific
-imports Main
+imports Base Main
begin
chapter {* Isabelle/ZF \label{ch:zf} *}