diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c92e7444b1f..531ea11f155 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2015-10-10  Jan Hubicka  <hubicka@ucw.cz>
+
+	* tree.c (type_with_interoperable_signedness): New.
+	(gimple_canonical_types_compatible_p): Use it.
+	* tree.h (type_with_interoperable_signedness): Declare
+
 2015-10-10  Jan Hubicka  <hubicka@ucw.cz>
 
 	* fold-const.c (operand_equal_p): Document OEP_ADDRESS_OF