op.h: Note unstack use of OPf_SPECIAL

diff --git a/op.h b/op.h
index c660b31..e4fadf6 100644 (file)
--- a/op.h
+++ b/op.h
@@ -138,6 +138,7 @@ Deprecated.  Use C<GIMME_V> instead.
                                 */
                                 /*  On OP_PADRANGE, push @_ */
                                 /*  On OP_DUMP, has no label */
+                                /*  On OP_UNSTACK, in a foreach loop */
 
 /* old names; don't use in new code, but don't break them, either */
 #define OPf_LIST       OPf_WANT_LIST