diff --git a/doc/en/Art/Affine.xml b/doc/en/Art/Affine.xml
index a3c82cf96..95f9d97db 100644
--- a/doc/en/Art/Affine.xml
+++ b/doc/en/Art/Affine.xml
@@ -10,7 +10,7 @@
   </AssemblyInfo>
   <ThreadSafetyStatement>Gtk# is thread aware, but not thread safe; See the <link location="node:gtk-sharp/programming/threads">Gtk# Thread Programming</link> for details.</ThreadSafetyStatement>
   <Docs>
-    <summary>To be added</summary>
+    <summary>Defines an affine transformation</summary>
     <remarks>To be added</remarks>
   </Docs>
   <Base>