diff --git a/plugin_sample/META-INF/plugin.xml b/plugin_sample/META-INF/plugin.xml
index e59ce8307..490d387f6 100644
--- a/plugin_sample/META-INF/plugin.xml
+++ b/plugin_sample/META-INF/plugin.xml
@@ -66,8 +66,35 @@
 
   <!-- Actions -->
   <actions>
+    <!-- The <action> element defines an action to register.
+    The mandatory "id" attribute specifies an unique identifier for the action.
+    The mandatory "class" attribute specifies the full-qualified name of the class implementing the action.
+    The mandatory "text" attribute specifies the text of the action (tooltip for toolbar button or text for menu item).
+    The optional "use-shortcut-of" attribute specifies the ID of the action whose keyboard shortcut this action will use.
+    The optional "description" attribute specifies the text which is displayed in the status bar when the action is focused.
+    The optional "icon" attribute specifies the icon which is displayed on the toolbar button or next to the menu item. -->
     <action id="PluginSample.DummyAction" class="org.jetbrains.plugins.sample.SimpleAction" text="Dummy Action" description="Illustrates how to plug an action in">
+      <!-- The <keyboard-shortcut> node specifies the keyboard shortcut for the action. An action can have several keyboard shortcuts.
+      The mandatory "first-keystroke" attribute specifies the first keystroke of the action. The key strokes are specified according to the regular Swing rules.
+      The optional "second-keystroke" attribute specifies the second keystroke of the action.
+      The mandatory "keymap" attribute specifies the keymap for which the action is active. IDs of the standard keymaps are defined as
+      constants in the com.intellij.openapi.keymap.KeymapManager class. -->
       <keyboard-shortcut first-keystroke="control alt A" second-keystroke="C" keymap="$default"/>
+      <!-- The <mouse-shortcut> node specifies the mouse shortcut for the action. An action can have several mouse shortcuts.
+      The mandatory "keystroke" attribute specifies the clicks and modifiers for the action. It is defined as a sequence of words separated by spaces:
+      "button1", "button2", "button3" for the mouse buttons; "shift", "control", "meta", "alt", "altGraph" for the modifier keys;
+      "doubleClick" if the action is activated by a double-click of the button.
+      The mandatory "keymap" attribute specifies the keymap for which the action is active. IDs of the standard keymaps are defined as
+      constants in the com.intellij.openapi.keymap.KeymapManager class. -->
+      <mouse-shortcut keystroke="control button3 doubleClick" keymap="$default"/>
+      <!-- The <add-to-group> node specifies that the action should be added to an existing group. An action can be added to several groups.
+      The mandatory "group-id" attribute specifies the ID of the group to which the action is added.
+      The group must be implemented by an instance of the DefaultActionGroup class.
+      The mandatory "anchor" attribute specifies the position of the action in the group relative to other actions. It can have the values
+      "first", "last", "before" and "after".
+      The "relative-to-action" attribute is mandatory if the anchor is set to "before" and "after", and specifies the action before or after which
+      the current action is inserted. -->
+      <add-to-group group-id="ToolsMenu" anchor="after"/>
     </action>
   </actions>