diff --git a/docs/news.xml b/docs/news.xml
index 1af57f8af0..4f1bea4fb5 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -88,6 +88,19 @@
+
+
+ qemu: Report error if backing image format is not specified explicitly
+
+
+ For a long time libvirt was assuming that a backing file is RAW when
+ the format was not specified. This didn't pose a problem until blockdev
+ support was enabled in last release. Libivrt now requires that
+ the format is specified in the image metadata or domain XML and the
+ VM will refuse to start otherwise. Additionally the error message
+ now links to the knowledge base which summarizes how to fix the images.
+
+