diff --git a/src/structures/ModalResponse.js b/src/structures/ModalResponse.js
index ecb8db63..67191608 100644
--- a/src/structures/ModalResponse.js
+++ b/src/structures/ModalResponse.js
@@ -10,6 +10,7 @@ import util from "util";
  */
 class ModalResponse extends Interaction {
   #values;
+  #custom_id;
   /**
    * Creates a modal submitted interaction structure.
    * @param {Client} client The client instance.
@@ -23,6 +24,13 @@ class ModalResponse extends Interaction {
     if (typeof data !== "object")
       throw new TypeError("GLUON: Data must be an object");
 
+    /**
+     * The custom id of the button.
+     * @type {String}
+     * @private
+     */
+    this.#custom_id = data.data.custom_id;
+
     /**
      * The entered modal values.
      * @type {Array<Object>}
@@ -31,6 +39,16 @@ class ModalResponse extends Interaction {
     this.#values = data.data.components[0].components;
   }
 
+  /**
+   * The custom id of the modal.
+   * @type {String}
+   * @readonly
+   * @public
+   */
+  get customId() {
+    return this.#custom_id;
+  }
+
   /**
    * The entered modal values.
    * @type {Array<Object>}
@@ -72,6 +90,7 @@ class ModalResponse extends Interaction {
         return {
           ...super.toJSON(format),
           values: this.values,
+          custom_id: this.customId,
         };
       }
       case TO_JSON_TYPES_ENUM.DISCORD_FORMAT:
@@ -79,6 +98,7 @@ class ModalResponse extends Interaction {
         return {
           ...super.toJSON(format),
           data: {
+            custom_id: this.customId,
             components: [
               {
                 components: this.values,
diff --git a/src/testData.js b/src/testData.js
index 8ea4b01a..c18684b2 100644
--- a/src/testData.js
+++ b/src/testData.js
@@ -736,6 +736,7 @@ export const TEST_DATA = {
     id: "123451189012345678",
     type: 5,
     data: {
+      custom_id: "test",
       components: [
         {
           type: 1,
diff --git a/test/structures/ModalResponse.js b/test/structures/ModalResponse.js
index 08314d34..e86d7e45 100644
--- a/test/structures/ModalResponse.js
+++ b/test/structures/ModalResponse.js
@@ -20,6 +20,7 @@ describe("ModalResponse", function () {
       expect(modalResponse).to.have.property("guildId");
       expect(modalResponse).to.have.property("channelId");
       expect(modalResponse).to.have.property("member");
+      expect(modalResponse).to.have.property("customId");
       expect(modalResponse).to.have.property("values");
       expect(modalResponse).to.have.property("guild");
       expect(modalResponse).to.have.property("channel");
@@ -101,6 +102,7 @@ describe("ModalResponse", function () {
                 TEST_DATA.MODAL_RESPONSE.data.components[0].components,
             },
           ],
+          custom_id: TEST_DATA.MODAL_RESPONSE.data.custom_id,
         },
       });
     });
@@ -137,6 +139,7 @@ describe("ModalResponse", function () {
         },
         type: TEST_DATA.MODAL_RESPONSE.type,
         values: TEST_DATA.MODAL_RESPONSE.data.components[0].components,
+        custom_id: TEST_DATA.MODAL_RESPONSE.data.custom_id,
       });
       expect(
         modalResponse.toJSON(TO_JSON_TYPES_ENUM.DISCORD_FORMAT),
@@ -171,6 +174,7 @@ describe("ModalResponse", function () {
                 TEST_DATA.MODAL_RESPONSE.data.components[0].components,
             },
           ],
+          custom_id: "test",
         },
       });
     });