diff --git a/colophon.html b/colophon.html
index f7da3d6..3f18dec 100644
--- a/colophon.html
+++ b/colophon.html
@@ -17,6 +17,10 @@
     <tr>
       <td><i>
         Photograph probably taken by <a href="https://www.linkedin.com/in/uhitzel/">Uli</a>, in the year 2020 A.D.
+        Yours truly did some processing of Uli's photo in the software 
+        <a href='https://www.gimp.org/'>GIMP</a>, such as cropping,
+                                                                              and converting from colour to
+                                                                              Black And White
         </i>
         </td>
       </tr>