diff --git a/miniuri/miniuri.py b/miniuri/miniuri.py
index b5eaa6a..e7c35bf 100644
--- a/miniuri/miniuri.py
+++ b/miniuri/miniuri.py
@@ -56,7 +56,10 @@ class Uri(object):
         self.authority = uri.split("/")[0]
 
         # invoke path setter.
-        self.path = uri[len(self.authority) :]
+        offset = 0
+        if self.authority:
+            offset = len(self.authority)
+        self.path = uri[offset:]
 
     @property
     def authority(self):
@@ -76,12 +79,13 @@ class Uri(object):
     @authority.setter
     def authority(self, a):
         """set all the attribute that makeup a authority"""
-        self.username = self.password = self.port = None
-        self.hostname = a
-        if "@" in self.hostname:
-            self.userinfo, self.hostname = a.split("@")  # userinfo setter
-        if ":" in self.hostname:
-            self.hostname, self.port = self.hostname.split(":")
+        if a:
+            self.username = self.password = self.port = None
+            self.hostname = a
+            if "@" in self.hostname:
+                self.userinfo, self.hostname = a.split("@")  # userinfo setter
+            if ":" in self.hostname:
+                self.hostname, self.port = self.hostname.split(":")
 
     @property
     def relative_uri(self):
diff --git a/setup.py b/setup.py
index a63ee18..47203ed 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@ from setuptools import setup, find_packages
 
 setup(
     name="miniuri",
-    version="1.0.6",
+    version="1.0.7",
     long_description=open("README.rst").read(),
     description="miniuri: The Universal URI Parser",
     keywords="miniuri uri url parser",
diff --git a/test_miniuri.py b/test_miniuri.py
index ae79a87..22300b1 100644
--- a/test_miniuri.py
+++ b/test_miniuri.py
@@ -185,6 +185,15 @@ class TestMiniUri(TestCase):
     def test_relative_uri(self):
         self.assertEqual(self.u.relative_uri, "/path/filename.jpg?p=2#5")
 
+    def test_only_relative_uri(self):
+        u = Uri("/about.html")
+        self.assertEqual(u.relative_uri, "/about.html")
+        self.assertEqual(u.filename, "about.html")
+        self.assertEqual(u.extension, "html")
+        self.assertIsNone(u.fragment, None)
+        self.assertIsNone(u.hostname, None)
+        self.assertIsNone(u.scheme, None)
+
     def test_empty_uri_sets_attrs_to_none(self):
         self.u.uri = ""
         self.assertEqual(self.u.uri, "")
@@ -246,3 +255,19 @@ class TestMiniUri(TestCase):
         self.assertIsNone(self.u.fragment)
         self.assertIsNone(self.u.extension)
         self.assertIsNone(self.u.authority)
+
+    def test_ssm_uri(self):
+        self.u = Uri("ssm:///path/to/my/parameter")
+        self.assertEqual(self.u.uri, "ssm:///path/to/my/parameter")
+        self.assertEqual(self.u.scheme, "ssm")
+        self.assertIsNone(self.u.username)
+        self.assertIsNone(self.u.password)
+        self.assertIsNone(self.u.hostname)
+        self.assertIsNone(self.u.port)
+        self.assertEqual(self.u.path, "/path/to/my/parameter")
+        self.assertEqual(self.u.filename, "parameter")
+        self.assertIsNone(self.u.query)
+        self.assertIsNone(self.u.fragment)
+        self.assertIsNone(self.u.extension)
+        self.assertIsNone(self.u.authority)
+