diff --git a/wptrunner/update.py b/wptrunner/update.py
index 1f718c18933122..4a56ada0a605d1 100644
--- a/wptrunner/update.py
+++ b/wptrunner/update.py
@@ -17,6 +17,36 @@
 
 base_path = os.path.abspath(os.path.split(__file__)[0])
 
+bsd_license = """W3C 3-clause BSD License
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+* Redistributions of works must retain the original copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the original copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+
+* Neither the name of the W3C nor the names of its contributors may be
+  used to endorse or promote products derived from this work without
+  specific prior written permission.
+
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+"""
 
 def do_test_relative_imports(test_root):
     global manifest
@@ -119,6 +149,12 @@ def copy_work_tree(self, dest):
             dest_path = os.path.join(dest, destination, os.path.split(source)[1])
             shutil.copy2(source_path, dest_path)
 
+        self.add_license(dest)
+
+    def add_license(self, dest):
+        with open(os.path.join(dest, "LICENSE"), "w") as f:
+            f.write(bsd_license)
+
 
 class NoVCSTree(object):
     name = "non-vcs"