diff --git a/qemu-img.texi b/qemu-img.texi
index 77c6d0b..77b2c47 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -4,6 +4,14 @@ usage: qemu-img command [command options]
 @c man end
 @end example
 
+@c man begin DESCRIPTION
+qemu-img allows you to create, convert and modify images offline. It can handle
+all image formats supported by QEMU.
+
+@b{Warning:} Never use qemu-img to modify images in use by a running virtual
+machine or any other process; this may destroy the image.
+@c man end
+
 @c man begin OPTIONS
 
 The following commands are supported: