diff --git a/src/include/ChangeLog b/src/include/ChangeLog
index 43a383949..216b4713f 100644
--- a/src/include/ChangeLog
+++ b/src/include/ChangeLog
@@ -1,6 +1,6 @@
-2000-05-21  Paolo Nenzi <p.nenzi@ieee.org>
+2000-05-22  Paolo Nenzi <p.nenzi@ieee.org>
 
-	* Makefile.am : removed reference to fteconst.h
+	* inpptree.h: Applied Widlok patch (u2 function).
 
 1999-11-30  Emmanuel Rouat  <emmanuel.rouat@wanadoo.fr>
 
diff --git a/src/include/inpptree.h b/src/include/inpptree.h
index 1d08ea7df..5d8d2cb26 100644
--- a/src/include/inpptree.h
+++ b/src/include/inpptree.h
@@ -92,6 +92,9 @@ typedef struct INPparseNode {
 #define PTF_SGN		18
 #define PTF_USTEP	19
 #define PTF_URAMP	20
+/* MW. PTF_CIF - next function */
+#define PTF_USTEP2	21
+
 
 /* The following things are used by the parser -- these are the token types the
  * lexer returns.
@@ -155,6 +158,8 @@ extern double PTsqrt();
 extern double PTtan();
 extern double PTtanh();
 extern double PTustep();
+/* MW. PTcif declaration */
+extern double PTustep2();
 extern double PTuramp();
 extern double PTuminus();