- * @param string $icon_url The url to the icon to be used for this menu. Using 'none' would leave div.wp-menu-image empty
- * so an icon can be added as background with CSS.
+ * @param string $icon_url The url to the icon to be used for this menu.
+ * * Pass a base64-encoded SVG using a data URI, which will be colored to match the color scheme.
+ * This should begin with 'data:image/svg+xml;base64,'.
+ * * Pass the name of a Dashicons helper class to use a font icon, e.g. 'dashicons-chart-pie'.
+ * * Pass 'none' to leave div.wp-menu-image empty so an icon can be added via CSS.