diff --git a/configschema.json b/configschema.json
index 51ffb03..96ed685 100644
--- a/configschema.json
+++ b/configschema.json
@@ -193,6 +193,12 @@
           "type": "string",
           "default": "SHORTNAME"
         },
+        "useJapanese": {
+          "$comment": "DEPRECATED; should be removed in next major version (2.x > 3.x).",
+          "description": "DEPRECATED; left for compatibility reasons.",
+          "type": "boolean",
+          "default": false
+        },
         "ignoreGamesWhileImporting": {
           "$ref": "#/definitions/ignoreGamesWhileImporting"
         },
@@ -213,6 +219,7 @@
       },
       "required": [
         "defaultMarathon",
+        "useJapanese",
         "disableSpeedrunComLookup"
       ]
     },
diff --git a/src/types/schemas/configschema.d.ts b/src/types/schemas/configschema.d.ts
index c98a732..95d485b 100644
--- a/src/types/schemas/configschema.d.ts
+++ b/src/types/schemas/configschema.d.ts
@@ -37,6 +37,10 @@ export interface Configschema {
 	horaro: Horaro;
 	oengus: {
 		defaultMarathon: string;
+		/**
+		 * DEPRECATED; left for compatibility reasons.
+		 */
+		useJapanese: boolean;
 		ignoreGamesWhileImporting?: IgnoreGamesWhileImporting;
 		disableSpeedrunComLookup: boolean;
 		useSandbox?: boolean | null;