diff --git a/libs/common/src/tools/util.ts b/libs/common/src/tools/util.ts
index e8292ec5b1a..0fcb5a972af 100644
--- a/libs/common/src/tools/util.ts
+++ b/libs/common/src/tools/util.ts
@@ -20,10 +20,14 @@ export function deepFreeze<T extends object>(value: T): Readonly<T> {
   return Object.freeze(value);
 }
 
+/** Type guard that returns `true` when the value is an i18n key.  */
 export function isI18nKey(value: I18nKeyOrLiteral): value is string {
   return typeof value === "string";
 }
 
-export function isLiteral(value: I18nKeyOrLiteral): value is string {
+/** Type guard that returns `true` when the value requires no translation.
+ *  @remarks the literal value can be accessed using the `.literal` property.
+ */
+export function isLiteral(value: I18nKeyOrLiteral): value is { literal: string } {
   return typeof value === "object" && "literal" in value;
 }