Updated help
diff --git a/plugins/org.eclipse.app4mc.help/docu/release_notes.textile b/plugins/org.eclipse.app4mc.help/docu/release_notes.textile
index edc3b2a..ac4743a 100644
--- a/plugins/org.eclipse.app4mc.help/docu/release_notes.textile
+++ b/plugins/org.eclipse.app4mc.help/docu/release_notes.textile
@@ -1,12 +1,13 @@
 h1. Release Notes
 
-h2. Eclipse APP4MC 3.1 (May 2023)
+h2. Eclipse APP4MC 3.1 (Jun 2023)
 
 Model handling
 * Model migration support (3.0.0 -> 3.1.0)
 
 Product
-* New visualization: Event chains
+* Updated frameworks: Visualization, Editor contribution
+* New visualizations: Tag members, Event chains
 * Updated visualization: Hardware structure
 * IDE examples included in the standard distribution
 * Several bug fixes
diff --git a/plugins/org.eclipse.app4mc.visualization.help/docu/user_visualization.textile b/plugins/org.eclipse.app4mc.visualization.help/docu/user_visualization.textile
index f936e32..9d04574 100644
--- a/plugins/org.eclipse.app4mc.visualization.help/docu/user_visualization.textile
+++ b/plugins/org.eclipse.app4mc.visualization.help/docu/user_visualization.textile
@@ -107,10 +107,7 @@
         <p>
             For performance reasons, the visualization has been limited to models
             containing at most 200 runnables. This limitation does not apply to
-            the
-            export of the graph in
-            DOT
-            format.
+            the export of the graph in DOT format.
         </p>
         <p>
             <img src="../pictures/datadependency_screenshot.png" />
@@ -195,6 +192,20 @@
 
 * +Object References View+<br/><br/>This visualization shows objects that refer to the selected object.<br/><br/>!../pictures/object_references.png!
 
+
+h4. Specific back-references
+
+The visualizations in this section show a simple list of objects that refer to the selected attribute.
+
+A double click on a list item allows to navigate to the corresponding object.
+
+* +Namespace members+<br/><br/>!../pictures/namespace_references.png!
+
+Further visualizations (without screenshot):
+
+* +Tag members+
+
+
 h4. Eventchain Map
 
 * +Eventchain Map+<br/><br/>This visualization shows the (nested) segments of an event chain.<br/><br/>!../pictures/eventchain_map.png!
diff --git a/plugins/org.eclipse.app4mc.visualization.help/pictures/datadependency_screenshot.png b/plugins/org.eclipse.app4mc.visualization.help/pictures/datadependency_screenshot.png
index 67ca39e..60ceb14 100644
--- a/plugins/org.eclipse.app4mc.visualization.help/pictures/datadependency_screenshot.png
+++ b/plugins/org.eclipse.app4mc.visualization.help/pictures/datadependency_screenshot.png
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diff --git a/plugins/org.eclipse.app4mc.visualization.help/pictures/hwmodel_hwblockdiagram.png b/plugins/org.eclipse.app4mc.visualization.help/pictures/hwmodel_hwblockdiagram.png
index a39d845..b22e759 100644
--- a/plugins/org.eclipse.app4mc.visualization.help/pictures/hwmodel_hwblockdiagram.png
+++ b/plugins/org.eclipse.app4mc.visualization.help/pictures/hwmodel_hwblockdiagram.png
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diff --git a/plugins/org.eclipse.app4mc.visualization.help/pictures/namespace_references.png b/plugins/org.eclipse.app4mc.visualization.help/pictures/namespace_references.png
new file mode 100644
index 0000000..4125fe7
--- /dev/null
+++ b/plugins/org.eclipse.app4mc.visualization.help/pictures/namespace_references.png
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