diff --git a/src/site/apt/upgrading.apt b/src/site/apt/upgrading.apt
index ccd92440..bc11a964 100644
--- a/src/site/apt/upgrading.apt
+++ b/src/site/apt/upgrading.apt
@@ -4,7 +4,13 @@
 
 Upgrading from version 1.3.0 to 1.3.1
 
-	No changes requiring upgrading were made between version 1.3.0 and 1.3.1.
+	One minor change might affect users of DirContextAdapter.
+
+        * The method <<<getObjectAttribute>>>, and consequently also <<<getStringAttribute>>>,
+          now treats an existing attribute with an empty set of values as if the
+          attribute doesn't exist, and thus returns <<<null>>>. In order to determine
+          whether an attribute in fact exists, a new method <<<attributeExists>>> was
+          added.
 
 Upgrading from version 1.3.0-RC1 to 1.3.0