diff --git a/demo_docs/source/index.rst b/demo_docs/source/index.rst
index 49f4e151..6987c62e 100644
--- a/demo_docs/source/index.rst
+++ b/demo_docs/source/index.rst
@@ -277,6 +277,7 @@ Images
 
 .. figure:: static/yi_jing_01_chien.jpg
     :align: right
+    :figwidth: 200px
 
     This is a caption for a figure. It can be very long and span several lines.