Add note about phantomjs binary and PNG rendering.

docs/sources/reference/sharing.md

@@ -30,7 +30,8 @@ after a certain time period.
 ## Share Panel
 ## Share Panel
 Click a panel title to open the panel menu, then click share in the panel menu to open the Share Panel dialog. Here you
 Click a panel title to open the panel menu, then click share in the panel menu to open the Share Panel dialog. Here you
 have access to a link that will take you to exactly this panel with the current time range and selected template variables.
 have access to a link that will take you to exactly this panel with the current time range and selected template variables.
-You also get a link to service side rendered PNG of the panel. Useful if you want to shara image of the panel.
+You also get a link to service side rendered PNG of the panel. Useful if you want to share an image of the panel.
+Please note that for OSX and Windows, you will need to ensure that a `phantomjs` binary is available under `vendor/phantomjs/phantomjs`. For Linux, a `phantomjs` binary should be included.
 
 
 ### Embed Panel
 ### Embed Panel
 You can embed a panel using an iframe on another web site. This tab will show you the html that you need to use.
 You can embed a panel using an iframe on another web site. This tab will show you the html that you need to use.