diff --git a/README.md b/README.md
index d49e57c..fba1938 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,23 @@
 Python client for Testdroid Cloud APIv2
 =======================================
 
+Dependencies
+-----
+
+For Linux installatin you need Python dev package.
+
+Ubuntu
+`sudo apt-get install python-dev`
+
 Command line
 -----
 
 Install it with:
 `sudo pip install testdroid`
 
+Upgrade it with:
+`sudo pip install testdroid --upgrade`
+
 Usage
 -----
 
@@ -45,3 +56,8 @@ Usage
 `testdroid`
 
 
+Troubleshooting
+-----
+
+If you see Pillow error messages on Linux you are most likely missing python-dev, see dependencies.
+
diff --git a/testdroid/__init__.py b/testdroid/__init__.py
index 4a08a64..b92ffa0 100755
--- a/testdroid/__init__.py
+++ b/testdroid/__init__.py
@@ -243,7 +243,7 @@ def get_device_groups(self):
     """ Returns list of devices
     """
     def get_devices(self, limit=0):
-        return self.get("devices?limit=%s" % (limit))
+        return self.get(path = "devices", payload = {'limit': limit})
 
     """ Print device groups
     """
@@ -437,7 +437,7 @@ def stop_device_session(self, device_session_id):
     """ Get all test runs for a project
     """
     def get_project_test_runs(self, project_id, limit=20):
-        return self.get("me/projects/%s/runs?limit=%s" % (project_id, limit))
+        return self.get(path = "me/projects/%s/runs" & project_id, payload = {'limit': limit})
 
     """ Print test runs of a project to console
     """
@@ -454,7 +454,7 @@ def get_test_run(self, project_id, test_run_id):
     """ Return device runs for a project
     """
     def get_device_runs(self, project_id, test_run_id, limit=1000):
-        return self.get("me/projects/%s/runs/%s/device-runs?limit=%s" % (project_id, test_run_id, limit))
+        return self.get(path = "me/projects/%s/runs/%s/device-runs" % (project_id, test_run_id), payload = {'limit': limit})
 
     """ Downloads screenshots list for a device run
     """