diff --git a/src/models/targethours.ts b/src/models/targethours.ts
index 2e080459..dd2dc048 100644
--- a/src/models/targethours.ts
+++ b/src/models/targethours.ts
@@ -1,25 +1,74 @@
-export type TargethoursRow = {
+export enum TargethoursRowType {
+  Weekly = "weekly",
+  Monthly = "monthly",
+}
+
+type CommonTargethoursRow = {
+  /** The ID of the target hour settings  */
   id: number;
-  usersId: number;
-  type: string;
+  /**
+   * Date from which on the target hours apply
+   * Format YYYY-MM-DD
+   */
   dateSince: string;
+  /**
+   * Date until which the target hours apply
+   * Format YYYY-MM-DD
+   */
   dateUntil: string | null;
+  /**
+   * Automatic time compensation per month in hours
+   */
+  compensationMonthly: number;
+  /** The related employee's ID */
+  usersId: number;
+};
+
+export type TargethoursRowWeekly = CommonTargethoursRow & {
+  /** Type of the target hours row */
+  type: TargethoursRowType.Weekly;
+  /** Target hours for Monday */
   monday: number;
+  /** Target hours for Tuesday */
   tuesday: number;
+  /** Target hours for Wednesday */
   wednesday: number;
+  /** Target hours for Thursday */
   thursday: number;
+  /** Target hours for Friday */
   friday: number;
+  /** Target hours for Saturday */
   saturday: number;
+  /** Target hours for Sunday */
   sunday: number;
+  /**
+   * true if credited absence hours are applied against the average target hours,
+   * false if credited absence hours match the target hours of the specific day .
+   */
   absenceFixedCredit: boolean;
+  /** Automatic time compensation per day in minutes  */
   compensationDaily: number;
-  compensationMonthly: number;
+};
+
+export type TargethoursRowMonthly = CommonTargethoursRow & {
+  /** Type of the target hours row */
+  type: TargethoursRowType.Monthly;
+  /** Monthly target hours to attain  */
   monthlyTarget: number;
+  /** Is Monday a work day? */
   workdayMonday: boolean;
+  /** Is Tuesday a work day? */
   workdayTuesday: boolean;
+  /** Is Wednesday a work day? */
   workdayWednesday: boolean;
+  /** Is Thursday a work day? */
   workdayThursday: boolean;
+  /** Is Friday a work day? */
   workdayFriday: boolean;
+  /** Is Saturday a work day? */
   workdaySaturday: boolean;
+  /** Is Sunday a work day? */
   workdaySunday: boolean;
 };
+
+export type TargethoursRow = TargethoursRowWeekly | TargethoursRowMonthly;