diff --git a/README.md b/README.md
index b9813ae..69dfbbd 100644
--- a/README.md
+++ b/README.md
@@ -370,7 +370,7 @@ You can also specify custom headers on requests:
 
 ```js
 SDK.appointments
-  .headers({'X-Scheduling-Rules', 'disallow-appointment-overlap'})
+  .headers({ 'X-Scheduling-Rules' : 'disallow-appointment-overlap' })
   .update({
     /* insert properties of appointment here */
   })
diff --git a/src/Skedify.test.js b/src/Skedify.test.js
index e23dad6..225ff16 100644
--- a/src/Skedify.test.js
+++ b/src/Skedify.test.js
@@ -387,6 +387,31 @@ describe('API/Config', () => {
     uninstallSkedifySDKMock(SDK)
   })
 
+  it('should be possible to set custom headers', async () => {
+    const SDK = new API({
+      auth_provider: API.createAuthProviderString('public_client', {
+        client_id: 'someclientidtokengoeshere',
+        realm: 'http://127.0.0.1',
+      }),
+      locale: 'nl-BE',
+      headers: {
+        Host: 'api.example.com',
+      },
+    })
+
+    installSkedifySDKMock(SDK)
+
+    expect(
+      await matchRequest(
+        SDK.appointments().headers({
+          'X-Scheduling-Rules': 'disallow-appointment-overlap',
+        })
+      )
+    ).toMatchSnapshot()
+
+    uninstallSkedifySDKMock(SDK)
+  })
+
   it('should throw when a resource requires a custom domain endpoint when it is not defined', () => {
     const SDK = new API({
       auth_provider: API.createAuthProviderString('public_client', {
diff --git a/src/__snapshots__/Skedify.test.js.snap b/src/__snapshots__/Skedify.test.js.snap
index 33691f8..1e533b8 100644
--- a/src/__snapshots__/Skedify.test.js.snap
+++ b/src/__snapshots__/Skedify.test.js.snap
@@ -1874,6 +1874,24 @@ Object {
 }
 `;
 
+exports[`API/Config should be possible to set custom headers 1`] = `
+Object {
+  "data": undefined,
+  "headers": Object {
+    "Accept": "application/json, text/plain, */*",
+    "Accept-Language": "nl-BE, nl;q=0.667, *;q=0.333",
+    "Authorization": "Bearer fake_example_access_token",
+    "Cache-Control": "no-store",
+    "Host": "api.example.com",
+    "Pragma": "no-cache",
+    "X-Scheduling-Rules": "disallow-appointment-overlap",
+  },
+  "method": "get",
+  "params": undefined,
+  "url": "http://127.0.0.1/appointments",
+}
+`;
+
 exports[`API/Config should throw an error when onConfigurationChange is not passed a function 1`] = `"[CONFIG]: You tried to call \`.onConfigurationChange(null)\` but it must receive a function."`;
 
 exports[`API/Config should throw an error when overriding items on the configuration object directly 1`] = `"Cannot assign to read only property 'locale' of object '#<Object>'"`;
diff --git a/src/resources/__snapshots__/index.test.js.snap b/src/resources/__snapshots__/index.test.js.snap
index 8d708ec..8a36265 100644
--- a/src/resources/__snapshots__/index.test.js.snap
+++ b/src/resources/__snapshots__/index.test.js.snap
@@ -78,6 +78,7 @@ Object {
       "start",
       "end",
       "contact",
+      "office",
       "page",
       "per_page",
     ],
@@ -1045,6 +1046,14 @@ Object {
         "key": "location[geolocation]",
         "name": "geolocation",
       },
+      Object {
+        "key": "location[country]",
+        "name": "country",
+      },
+      Object {
+        "key": "location[postal_code]",
+        "name": "postal_code",
+      },
       "limit",
       "page",
       "per_page",
diff --git a/src/resources/appointments.js b/src/resources/appointments.js
index 105b1e2..51ac0e5 100644
--- a/src/resources/appointments.js
+++ b/src/resources/appointments.js
@@ -20,7 +20,7 @@ export const appointments = createResourceDescription(
       'outcomes',
       'appointment_outcomes',
     ],
-    filters: ['uuid', 'state', 'start', 'end', 'contact'],
+    filters: ['uuid', 'state', 'start', 'end', 'contact', 'office'],
     headers: {
       [HTTP_VERB_POST]: {
         recaptcha: (value) => {
diff --git a/src/resources/offices.js b/src/resources/offices.js
index a9f17f9..6797c01 100644
--- a/src/resources/offices.js
+++ b/src/resources/offices.js
@@ -31,6 +31,8 @@ export const offices = createResourceDescription(
       'schedulable',
       'nearest_to_geo',
       { name: 'geolocation', key: 'location[geolocation]' },
+      { name: 'country', key: 'location[country]' },
+      { name: 'postal_code', key: 'location[postal_code]' },
       'limit',
     ],
   },