diff -r 34ed34804d90 -r 7860ffc5ec08 doc-src/IsarImplementation/Thy/document/Logic.tex
--- a/doc-src/IsarImplementation/Thy/document/Logic.tex	Mon Jun 06 17:51:14 2011 +0200
+++ b/doc-src/IsarImplementation/Thy/document/Logic.tex	Mon Jun 06 18:05:38 2011 +0200
@@ -705,6 +705,7 @@
   \begin{mldecls}
   \indexdef{}{ML type}{thm}\verb|type thm| \\
   \indexdef{}{ML}{proofs}\verb|proofs: int Unsynchronized.ref| \\
+  \indexdef{}{ML}{Thm.transfer}\verb|Thm.transfer: theory -> thm -> thm| \\
   \indexdef{}{ML}{Thm.assume}\verb|Thm.assume: cterm -> thm| \\
   \indexdef{}{ML}{Thm.forall\_intr}\verb|Thm.forall_intr: cterm -> thm -> thm| \\
   \indexdef{}{ML}{Thm.forall\_elim}\verb|Thm.forall_elim: cterm -> thm -> thm| \\
@@ -752,6 +753,13 @@
   records full proof terms.  Officially named theorems that contribute
   to a result are recorded in any case.
 
+  \item \verb|Thm.transfer|~\isa{thy\ thm} transfers the given
+  theorem to a \emph{larger} theory, see also \secref{sec:context}.
+  This formal adjustment of the background context has no logical
+  significance, but is occasionally required for formal reasons, e.g.\
+  when theorems that are imported from more basic theories are used in
+  the current situation.
+
   \item \verb|Thm.assume|, \verb|Thm.forall_intr|, \verb|Thm.forall_elim|, \verb|Thm.implies_intr|, and \verb|Thm.implies_elim|
   correspond to the primitive inferences of \figref{fig:prim-rules}.