diff --git a/NEW b/NEW
index 063d986e3..bb3a5f5c4 100644
--- a/NEW
+++ b/NEW
@@ -1,3 +1,5 @@
+Notes for the 5th ACK distribution:
+
 It is not wise to mix files created by the previous version of the Kit
 with files belonging to this version, although that might sometimes work.
 Many problems with the previous distribution have been fixed.
@@ -21,6 +23,15 @@ Also added, but not part of the Kit proper are
 
 See the ACK installation manual for their copyright notices.
 
+This version is usually refered to as 5.0.
+
+Notes for update 1 of the 5th ACK distribution:
+
+This is a complete distribution, but does not deserve a new version number,
+as the only addition is the support for Solaris 2 on SPARCs. It also contains
+many bug fixes.
+We refer to this version as 5.1.
+
 --
 Ceriel Jacobs, Dept. of Mathematics and Computer Science, Vrije Universiteit,
 De Boelelaan 1081a, 1081 HV Amsterdam, The Netherlands