diff --git a/presubmit_support.py b/presubmit_support.py
index 3ab154987..a7b58c8a1 100755
--- a/presubmit_support.py
+++ b/presubmit_support.py
@@ -6,7 +6,7 @@
 """Enables directory-specific presubmit checks to run at upload and/or commit.
 """
 
-__version__ = '1.0.1'
+__version__ = '1.1'
 
 # TODO(joi) Add caching where appropriate/needed. The API is designed to allow
 # caching (between all different invocations of presubmit scripts for a given
@@ -162,6 +162,8 @@ class InputApi(object):
       change: A presubmit.GclChange object.
       presubmit_path: The path to the presubmit script being processed.
     """
+    # Version number of the presubmit_support script.
+    self.version = [int(x) for x in __version__.split('.')]
     self.change = change
 
     # We expose various modules and functions as attributes of the input_api
diff --git a/tests/presubmit_unittest.py b/tests/presubmit_unittest.py
index 1d1a9b490..88b2f71b7 100755
--- a/tests/presubmit_unittest.py
+++ b/tests/presubmit_unittest.py
@@ -404,7 +404,7 @@ class InputApiUnittest(PresubmitTestsBase):
       'PresubmitLocalPath', 'RightHandSideLines', 'ServerPaths',
       'basename', 'cPickle', 'cStringIO', 'canned_checks', 'change',
       'marshal', 'os_path', 'pickle', 'platform',
-      're', 'subprocess', 'tempfile', 'urllib2',
+      're', 'subprocess', 'tempfile', 'urllib2', 'version',
     ]
     # If this test fails, you should add the relevant test.
     self.compareMembers(presubmit.InputApi(None, './.'), members)