diff --git a/src/types/model/sharedSliceVariation.ts b/src/types/model/sharedSliceVariation.ts
index ef856a12..760145cb 100644
--- a/src/types/model/sharedSliceVariation.ts
+++ b/src/types/model/sharedSliceVariation.ts
@@ -1,4 +1,7 @@
-import type { CustomTypeModelFieldForGroup } from "./types";
+import type {
+	CustomTypeModelFieldForGroup,
+	CustomTypeModelFieldForSlice,
+} from "./types";
 
 /**
  * A shared Slice variation.
@@ -10,6 +13,10 @@ import type { CustomTypeModelFieldForGroup } from "./types";
  */
 export interface SharedSliceModelVariation<
 	ID extends string = string,
+	Fields extends Record<string, CustomTypeModelFieldForSlice> = Record<
+		string,
+		CustomTypeModelFieldForSlice
+	>,
 	PrimaryFields extends Record<string, CustomTypeModelFieldForGroup> = Record<
 		string,
 		CustomTypeModelFieldForGroup
@@ -24,6 +31,7 @@ export interface SharedSliceModelVariation<
 	docURL: string;
 	version: string;
 	description: string;
+	fields?: Fields;
 	primary?: PrimaryFields;
 	items?: ItemFields;
 	imageUrl: string;
diff --git a/src/types/model/types.ts b/src/types/model/types.ts
index 1ac2840c..dfddc75d 100644
--- a/src/types/model/types.ts
+++ b/src/types/model/types.ts
@@ -89,3 +89,13 @@ export type CustomTypeModelFieldForGroup =
 	| CustomTypeModelKeyTextField
 	| CustomTypeModelTimestampField
 	| CustomTypeModelSeparatorField;
+
+/**
+ * Any custom type field that is valid for a slice.
+ *
+ * **Note**: This type is only valid for a slice's `fields` property. It cannot
+ * be used for the deprecated `primary` or `items` properties.
+ */
+export type CustomTypeModelFieldForSlice =
+	| CustomTypeModelGroupField
+	| CustomTypeModelFieldForGroup;