diff --git a/app/views/docs/charts.html.erb b/app/views/docs/charts.html.erb
index 6556de3..9f3aee0 100644
--- a/app/views/docs/charts.html.erb
+++ b/app/views/docs/charts.html.erb
@@ -28,8 +28,8 @@
       <li><b>color</b> (string) Line color, default: red (optional)</li>
       <li><b>bgcolor</b> (string) Background color, default: white (optional)</li>
       <li><b>type</b> (line/bar/column) Type of chart, default: line (optional)</li>
-      <li><b>width</b> (integer) Chart width in pixels, iframe width will be 20px larger, default chart width: 400 (optional)</li>
-      <li><b>height</b> (integer) Chart height in pixels, iframe height will be 20px larger, default chart height: 200 (optional)</li>
+      <li><b>width</b> (integer) Chart width in pixels, iframe width will be 20px larger, default chart width: 400. Set to <i>auto</i> to automatically adjust chart size based on its parent container. (optional)</li>
+      <li><b>height</b> (integer) Chart height in pixels, iframe height will be 20px larger, default chart height: 200. Set to <i>auto</i> to automatically adjust chart size based on its parent container. (optional)</li>
       <li><b>dynamic</b> (true/false) Make chart update automatically every 15 seconds, default: false (optional)</li>
       <li><b>step</b> (true/false) Draw chart as a step chart, default: false (optional)</li>
       <li><b>export</b> (true/false) Show export buttons, so that chart can be saved as an image, default: false (optional)</li>