include 2.3.1
diff --git a/LICENSE b/LICENSE
index c5b5923..fd4f5f8 100644
--- a/LICENSE
+++ b/LICENSE
@@ -43,6 +43,7 @@
     2.2.2           2.2.1       2002        PSF         yes
     2.2.3           2.2.2       2003        PSF         yes
     2.3             2.2.2       2002-2003   PSF         yes
+    2.3.1           2.3         2002-2003   PSF         yes
 
 Footnotes: