diff --git a/packages/block-editor/README.md b/packages/block-editor/README.md
index 82278316e823a..17934b030b5dd 100644
--- a/packages/block-editor/README.md
+++ b/packages/block-editor/README.md
@@ -499,6 +499,8 @@ _Properties_
 -   _\_\_experimentalBlockDirectory_ `boolean`: Whether the user has enabled the Block Directory
 -   _\_\_experimentalEnableFullSiteEditing_ `boolean`: Whether the user has enabled Full Site Editing
 -   _\_\_experimentalEnableFullSiteEditingDemo_ `boolean`: Whether the user has enabled Full Site Editing Demo Templates
+-   _\_\_experimentalBlockPatterns_ `Array`: Array of objects representing the block patterns
+-   _\_\_experimentalBlockPatternCategories_ `Array`: Array of objects representing the block pattern categories
 
 <a name="SkipToSelectedBlock" href="#SkipToSelectedBlock">#</a> **SkipToSelectedBlock**
 
diff --git a/packages/block-editor/src/store/defaults.js b/packages/block-editor/src/store/defaults.js
index e6b987effc689..3c62084982791 100644
--- a/packages/block-editor/src/store/defaults.js
+++ b/packages/block-editor/src/store/defaults.js
@@ -35,6 +35,8 @@ export const PREFERENCES_DEFAULTS = {
  * @property {boolean} __experimentalBlockDirectory Whether the user has enabled the Block Directory
  * @property {boolean} __experimentalEnableFullSiteEditing Whether the user has enabled Full Site Editing
  * @property {boolean} __experimentalEnableFullSiteEditingDemo Whether the user has enabled Full Site Editing Demo Templates
+ * @property {Array} __experimentalBlockPatterns Array of objects representing the block patterns
+ * @property {Array} __experimentalBlockPatternCategories Array of objects representing the block pattern categories
  */
 export const SETTINGS_DEFAULTS = {
 	alignWide: false,
@@ -156,6 +158,9 @@ export const SETTINGS_DEFAULTS = {
 	__experimentalEnableFullSiteEditing: false,
 	__experimentalEnableFullSiteEditingDemo: false,
 	__mobileEnablePageTemplates: false,
+	__experimentalBlockPatterns: [],
+	__experimentalBlockPatternCategories: [],
+
 	gradients: [
 		{
 			name: __( 'Vivid cyan blue to vivid purple' ),