diff --git a/docs/reference/gtk/css-overview.xml b/docs/reference/gtk/css-overview.xml
index a5bb29cffb..157d071b3c 100644
--- a/docs/reference/gtk/css-overview.xml
+++ b/docs/reference/gtk/css-overview.xml
@@ -824,7 +824,7 @@ label {
       <programlisting><![CDATA[
 spinner {
   -gtk-icon-source: -gtk-icontheme('process-working-symbolic');
-  -gtk-icon-palette: success blue, error magenta;
+  -gtk-icon-palette: success blue, warning #fc3, error magenta;
 }
 arrow.fancy {
   -gtk-icon-source: -gtk-icontheme('pan-down');