diff --git a/docs/hierarchy.md b/docs/hierarchy.md
index c3d9d287..a534c5f1 100644
--- a/docs/hierarchy.md
+++ b/docs/hierarchy.md
@@ -6,7 +6,25 @@
 * function `getPropertyValue(name: Name, inherit: Boolean = false, includeStyles: Boolean = true, includeDefaults: Boolean = true)` - get property value with given layer flags.
 
 * function `setProperty(name: Name, item: Any?)` - a convenient method to set property node or value. If `item` is null, then node is removed, not a value
-Sets the `item` property to the element with the `name` identification. 
+Sets the `item` property to the element with the `name` identification.
+
+### VisionBase
+
+Basic vision implementation
+
+### VisionGroup
+
+A group of Visions.
+
+### MutableVisionGroup
+
+Mutable version of VisionGroup.
+
+low structure changes of this group. Unconsumed changes are discarded.
+
+### Solid
+
+Interface for 3-dimensional Vision.
 
 ### SolidGroup
 
@@ -14,6 +32,10 @@ Sets the `item` property to the element with the `name` identification.
 
 * function `prototypes(builder: VisionContainerBuilder<Solid>.() -> Unit)` - create or edit prototype node as a group. 
 
+### SolidReferenceGroup
+
+A reference Solid to reuse a template object.
+
 ### RootVisionGroup
 
 Non-serializable root group used to propagate manager to its children.