diff --git a/docs/images/ht9170.jpg b/docs/images/ht9170.jpg
new file mode 100644
index 00000000..61a6e9a5
Binary files /dev/null and b/docs/images/ht9170.jpg differ
diff --git a/src/ht9170/ht9170.h b/src/ht9170/ht9170.h
index 9c842f19..720e01c8 100644
--- a/src/ht9170/ht9170.h
+++ b/src/ht9170/ht9170.h
@@ -50,6 +50,7 @@ namespace upm {
    * Multi-Frequency) Shield.  It can decode DTMF signals presented at
    * it's audio input.  It does not generate DTMF signals.
    *
+   * @image html ht9170.jpg
    * @snippet ht9170.cxx Interesting
    */
   class HT9170 {