1 files changed, 3 insertions, 0 deletions
diff --git a/op.h b/op.h
index 8bc82769e7..2360f9b381 100644
--- a/op.h
+++ b/op.h
@@ -107,6 +107,9 @@ Deprecated.  Use C<GIMME_V> instead.
 	      : G_SCALAR)						\
 	   : dowantarray())
 
+/* NOTE: OP_NEXTSTATE, OP_DBSTATE, and OP_SETSTATE (i.e. COPs) carry lower
+ * bits of PL_hints in op_private */
+
 /* Private for lvalues */
 #define OPpLVAL_INTRO	128	/* Lvalue must be localized or lvalue sub */