diff --git a/docs/reference-guides/theme-json-reference/theme-json-living.md b/docs/reference-guides/theme-json-reference/theme-json-living.md
index 038b5d3605b76..4a224cc0cde5f 100644
--- a/docs/reference-guides/theme-json-reference/theme-json-living.md
+++ b/docs/reference-guides/theme-json-reference/theme-json-living.md
@@ -130,6 +130,7 @@ Settings related to position.
 
 | Property  | Type   | Default | Props  |
 | ---    | ---    | ---    |---   |
+| fixed | boolean | false |  |
 | sticky | boolean | false |  |
 
 ---
diff --git a/schemas/json/theme.json b/schemas/json/theme.json
index 2377af1c24ae1..2aeacad87365b 100644
--- a/schemas/json/theme.json
+++ b/schemas/json/theme.json
@@ -331,6 +331,11 @@
 					"description": "Settings related to position.",
 					"type": "object",
 					"properties": {
+						"fixed": {
+							"description": "Allow users to set fixed position.",
+							"type": "boolean",
+							"default": false
+						},
 						"sticky": {
 							"description": "Allow users to set sticky position.",
 							"type": "boolean",