diff --git a/src/common/services/Services.ts b/src/common/services/Services.ts
index cd1bc9cd4..32e67f181 100644
--- a/src/common/services/Services.ts
+++ b/src/common/services/Services.ts
@@ -350,7 +350,7 @@ export interface IUnicodeService {
   readonly versions: string[];
   /** Currently active version. */
   activeVersion: string;
-  /** Event triggered, when activate version changed. */
+  /** Event triggered when the active version changes. */
   readonly onChange: IEvent<string>;
 
   /**