Add text about circular references caused by storing frames in local
variables. This closes SF bug #543148.
diff --git a/Doc/lib/libinspect.tex b/Doc/lib/libinspect.tex
index 186fd58..a1293f0 100644
--- a/Doc/lib/libinspect.tex
+++ b/Doc/lib/libinspect.tex
@@ -321,3 +321,19 @@
Return a list of frame records for the stack below the current
exception.
\end{funcdesc}
+
+Stackframes stored directly or indirectly in local variables can
+easily cause reference cycles. Though the cycle detector will catch
+these, destruction of the frames (and local variables) can be made
+deterministic by removing the cycle in a \keyword{finally} clause.
+This is also important if the cycle detector was disabled when Python
+was compiled or using \function{gc.disable()}. For example:
+
+\begin{verbatim}
+def handle_stackframe_without_leak():
+ frame = inspect.currentframe()
+ try:
+ # do something with the frame
+ finally:
+ del frame
+\end{verbatim}