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diff --git a/src/libpspp/ChangeLog b/src/libpspp/ChangeLog
index 4d3df1353b..9e96563082 100644
--- a/src/libpspp/ChangeLog
+++ b/src/libpspp/ChangeLog
@@ -1,3 +1,35 @@
+2007-06-03  Ben Pfaff  <blp@gnu.org>
+
+	Add ability for reverse iteration to tower code.
+	
+	* tower.c (tower_last): New function.
+	(tower_prev): New function.
+	(abt_to_tower_node): New function.
+	(first_node): Use abt_to_tower_node.
+	(last_node): New function.
+	(next_ndoe): Use abt_to_tower_node.
+	(prev_node): New function.
+
+2007-06-03  Ben Pfaff  <blp@gnu.org>
+
+	* tower.c: Cache repeated lookups of a single tower element.  This
+	turns such lookups into O(1) operations without harming the big-O
+	of other operations.
+
+	* tower.h (struct tower): Add members for caching.
+
+	* range-set.c (range_set_clone): New function.
+
+	* array.c (insert_range): New function.
+	(insert_element): New function.
+	(move_range): New function.
+
+2007-04-25  Ben Pfaff  <blp@gnu.org>
+
+	* model-checker.c: Don't use type sighandler_t, which is a GNU
+	extension.  Reported by "Daniel E WILLIAMS"
+	<Daniel.E.Williams@state.or.us>.
+
 2007-04-25 John Darrington <john@darrington.wattle.id.au>
 
 	* i18n.c: Fixed bug converting long strings