Explaination about block label AND "Add Block" Dialog search feature.

15/umbraco-cms/fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/block-editor/block-grid-editor.md

@@ -71,6 +71,8 @@ Customize the user experience for your content editors when they work with the B
 
 * **Label** - Defines a label for the appearance of the Block in the editor. The label can use AngularJS template-string-syntax to display values of properties.
 
+This label is also used for search in the **Add Block** dialog during content editing. If no label is defined, the block will not be searchable. The search does not fall back to the block’s name.
+
 {% hint style="info" %}
 Label example: "My Block {=myPropertyAlias}" will be shown as: "My Block FooBar".
 {% endhint %}

15/umbraco-cms/fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/block-editor/block-list-editor.md

@@ -50,6 +50,9 @@ Each Block has a set of properties that are optional to configure. They are desc
 By configuring the properties in the group you can customize the user experience for your content editors when they work with the blocks in the Content section.
 
 * **Label** - Define a label for the appearance of the Block in the editor. The label uses [Umbraco Flavoured Markdown](../../../../../reference/umbraco-flavored-markdown.md) to display values of properties.
+
+This label is also used for search in the “Add Block” dialog during content editing. If no label is defined, the block will not be searchable. The search does not fall back to the block’s name.
+
 * **Overlay editor size** - Set the size for the Content editor overlay for editing this block.
 
 ### Data Models