diff --git a/README.rst b/README.rst
index 64e9513..173176d 100644
--- a/README.rst
+++ b/README.rst
@@ -898,7 +898,7 @@ importance specified. Filtering out Wishlist bugs if importance not specified.
 
 Example::
 
-  ./bugs-fixed-since.py --start=8.0.0 | \
+  ./bugs-fixed-since.py [...] --start=8.0.0 | \
   ./lp-filter-bugs-by-importance.py neutron
 
 List bugs that are fixed in master since 8.0.0 that are not of Wishlist
@@ -922,7 +922,7 @@ a tag specified.
 
 Example::
 
-  ./bugs-fixed-since.py --start=8.0.0 | \
+  ./bugs-fixed-since.py [...] --start=8.0.0 | \
   ./lp-filter-bugs-by-tag.py neutron --tag in-stable-mitaka
 
 List bugs that are fixed in master since 8.0.0 that don't have relevant fixes
@@ -937,7 +937,7 @@ detailed description for each of them.
 
 Example::
 
-  ./bugs-fixed-since.py --start=8.0.0 | ./annotate-lp-bugs neutron
+  ./bugs-fixed-since.py [...] --start=8.0.0 | ./annotate-lp-bugs neutron
 
 Pull in detailed description for bugs that are fixed in master since 8.0.0.
 
@@ -950,3 +950,15 @@ Clean up <*>-backport-potential tags for bugs with in-stable-<*> tag set.
 Example::
 
   ./lp-reset-backport-potential.py neutron python-neutronclient
+
+
+lp-tag.py
+---------
+
+Append a tag to bugs specified on stdin.
+
+Example::
+
+  ./bugs-fixed-since.py [...] --start=8.0.0 | ./lp-tag.py foo-tag
+
+This command will add the 'foo-tag' tag to all bugs fixed since 8.0.0.
diff --git a/lp-tag.py b/lp-tag.py
new file mode 100755
index 0000000..9e021ef
--- /dev/null
+++ b/lp-tag.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+"""
+This Launchpad tool is used to tag bugs with a tag.
+"""
+
+import argparse
+import sys
+
+from launchpadlib.launchpad import Launchpad
+
+
+def _parse_args():
+    parser = argparse.ArgumentParser(
+        description='Tag tags with a tag.')
+    parser.add_argument(
+        'tag', help='Tag to use')
+    return parser.parse_args()
+
+
+def main():
+    args = _parse_args()
+    lp = Launchpad.login_with('openstack-releasing', 'production')
+    bugnums = [line.strip() for line in sys.stdin.readlines()]
+    for bugnum in bugnums:
+        bug = lp.bugs[bugnum]
+        tag = args.tag
+        tags = bug.tags
+        if tag not in tags:
+            tags.append(tag)
+            bug.tags = tags
+            bug.lp_save()
+
+
+if __name__ == '__main__':
+    main()