diff --git a/bundles/org.eclipse.pde.doc.user/guide/images/preferences/plugin_development.png b/bundles/org.eclipse.pde.doc.user/guide/images/preferences/plugin_development.png
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--- a/bundles/org.eclipse.pde.doc.user/guide/images/preferences/plugin_development.png
+++ b/bundles/org.eclipse.pde.doc.user/guide/images/preferences/plugin_development.png
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diff --git a/bundles/org.eclipse.pde.doc.user/guide/tools/preference_pages/plug_in_development.htm b/bundles/org.eclipse.pde.doc.user/guide/tools/preference_pages/plug_in_development.htm
index edeb906..c1f52a9 100644
--- a/bundles/org.eclipse.pde.doc.user/guide/tools/preference_pages/plug_in_development.htm
+++ b/bundles/org.eclipse.pde.doc.user/guide/tools/preference_pages/plug_in_development.htm
@@ -34,6 +34,10 @@
 </p>
 <p><img src="../../images/preferences/target_statusbar.png" alt="Target platform status line item" ></p>  
 
+<p><strong>Workspace plug-ins override target platform plug-ins with the same id</strong> - 
+When selected, workspace plug-ins override target platform plug-ins. If one or more versions of a plug-in is open in the workspace, then all plug-ins with the same plug-in id get removed from the target platform. When this option is off, all plug-in versions from workspace and target platform are being used.
+</p>
+
 <h2>Plug-in presentation</h2>
 <p>By default, whenever a plug-in or a feature is presented in the UI (i.e. in the outline view, Plug-ins view, editors, etc.), the label shows the plug-in or feature ID followed by the plug-in or feature version. </p>
 <p>The <strong>Plug-in presentation</strong> preference is a global setting that allows you to show an alternate label for plug-ins and features composed of the (translated) name of the plug-in or feature followed by the plug-in or feature version. Source plug-in are filtered from views by default.  Selecting <strong>Show source plug-ins</strong> will make them visible in the UI.</p>