diff --git a/doc/rest_api.md b/doc/rest_api.md
index b84c838..43f4a52 100644
--- a/doc/rest_api.md
+++ b/doc/rest_api.md
@@ -504,6 +504,7 @@ This operation does not accept a request body.
 
 | Parameter   | Style | Type       | Description                                       |
 |-------------|-------|------------|---------------------------------------------------|
+| locations   | plain | xsd:list   | An optional list of placement location candidates. |
 | plan_name   | plain | xsd:string | The name of the plan.                             |
 | resources   | plain | xsd:dict   | A dictionary of resources to be planned. Each is keyed by an orchestration uuid. This is a UUID provided by an orchestration engine (e.g., heat-engine) prior to instantiation of a resource. The dictionary contains three keys: |
 |             |       |            | **name**: resource name                             |
diff --git a/valet/api/common/ostro_helper.py b/valet/api/common/ostro_helper.py
index 807028d..2952ba5 100644
--- a/valet/api/common/ostro_helper.py
+++ b/valet/api/common/ostro_helper.py
@@ -245,6 +245,11 @@ class Ostro(object):
             "stack_id": self.args['stack_id'],
         }
 
+        # Only add locations if we have it (no need for an empty object)
+        locations = self.args.get('locations')
+        if locations:
+            self.request['locations'] = locations
+
         if resources_update:
             # If we get any status in the response, it's an error. Bail.
             self.response = self._prepare_resources(resources_update)
diff --git a/valet/api/v1/controllers/plans.py b/valet/api/v1/controllers/plans.py
index db8da78..d8cbd21 100644
--- a/valet/api/v1/controllers/plans.py
+++ b/valet/api/v1/controllers/plans.py
@@ -27,6 +27,7 @@ from valet.api import LOG
 
 
 CREATE_SCHEMA = (
+    (decorators.optional('locations'), types.array),
     ('plan_name', types.string),
     ('resources', types.dictionary),
     ('stack_id', types.string),
@@ -237,7 +238,7 @@ class PlansController(object):
 
         kwargs = {
             'tenant_id': request.context['tenant_id'],
-            'args': args
+            'args': args,
         }
 
         # Prepare the request. If request prep fails,