diff --git a/src/models/Donation.ts b/src/models/Donation.ts
index 87f4e80..f7ea19c 100644
--- a/src/models/Donation.ts
+++ b/src/models/Donation.ts
@@ -1,4 +1,4 @@
-import { PrimaryGeneratedColumn, Column } from "typeorm";
+import { PrimaryGeneratedColumn, Column, ManyToOne } from "typeorm";
 import {
   IsInt,
   IsNotEmpty,
@@ -24,7 +24,7 @@ export abstract class Donation {
    */
   @Column()
   @IsNotEmpty()
-  //TODO: Relationship
+  @ManyToOne(() => Participant, donor => donor.donations)
   donor: Participant;
 
   /**
diff --git a/src/models/Participant.ts b/src/models/Participant.ts
index 2b356a3..1a8c245 100644
--- a/src/models/Participant.ts
+++ b/src/models/Participant.ts
@@ -1,4 +1,4 @@
-import { PrimaryGeneratedColumn, Column } from "typeorm";
+import { PrimaryGeneratedColumn, Column, OneToMany } from "typeorm";
 import {
   IsEmail,
   IsInt,
@@ -8,6 +8,7 @@ import {
   IsString,
 } from "class-validator";
 import { Address } from "./Address";
+import { Donation } from "./Donation";
 
 /**
  * Defines the participant interface.
@@ -72,4 +73,10 @@ export abstract class Participant {
   @IsOptional()
   @IsEmail()
   email?: string;
+
+  /**
+   * Used to link the participant as the donor of a donation.
+   */
+  @OneToMany(() => Donation, donation => donation.donor)
+  donations: Donation[];
 }
\ No newline at end of file