diff --git a/tools/patman/README b/tools/patman/README
index 53f55ce95d..e3466e6085 100644
--- a/tools/patman/README
+++ b/tools/patman/README
@@ -188,6 +188,11 @@ Series-prefix: prefix
 	well. If your format.subjectprefix is set to InternalProject, then
 	the patch shows like: [InternalProject][RFC/RESEND PATCH]
 
+Series-postfix: postfix
+	Sets the subject "postfix". Normally empty, but can be the name of a
+	tree such as net or net-next if that needs to be specified. The patch
+	subject is like [PATCH net] or [PATCH net-next].
+
 Series-name: name
 	Sets the name of the series. You don't need to have a name, and
 	patman does not yet use it, but it is convenient to put the branch
diff --git a/tools/patman/func_test.py b/tools/patman/func_test.py
index 2493e527f5..9f4e03e882 100644
--- a/tools/patman/func_test.py
+++ b/tools/patman/func_test.py
@@ -122,6 +122,7 @@ class TestFunctional(unittest.TestCase):
 
             Series-to: u-boot
             Series-prefix: RFC
+            Series-postfix: some-branch
             Series-cc: Stefan Brüns <stefan.bruens@rwth-aachen.de>
             Cover-letter-cc: Lord Mëlchett <clergy@palace.gov>
             Series-version: 3
@@ -176,7 +177,7 @@ class TestFunctional(unittest.TestCase):
             - each patch has the correct subject
             - dry-run information prints out correctly
             - unicode is handled correctly
-            - Series-to, Series-cc, Series-prefix, Cover-letter
+            - Series-to, Series-cc, Series-prefix, Series-postfix, Cover-letter
             - Cover-letter-cc, Series-version, Series-changes, Series-notes
             - Commit-notes
         """
@@ -235,6 +236,7 @@ class TestFunctional(unittest.TestCase):
         self.assertEqual('Cc:	  %s' % stefan, next(lines))
         self.assertEqual('Version:  3', next(lines))
         self.assertEqual('Prefix:\t  RFC', next(lines))
+        self.assertEqual('Postfix:\t  some-branch', next(lines))
         self.assertEqual('Cover: 4 lines', next(lines))
         self.assertEqual('      Cc:  %s' % self.fred, next(lines))
         self.assertEqual('      Cc:  %s' % self.leb,
@@ -285,7 +287,7 @@ Simon Glass (2):
 '''
         lines = open(cover_fname, encoding='utf-8').read().splitlines()
         self.assertEqual(
-            'Subject: [RFC PATCH v3 0/2] test: A test patch series',
+            'Subject: [RFC PATCH some-branch v3 0/2] test: A test patch series',
             lines[3])
         self.assertEqual(expected.splitlines(), lines[7:])
 
diff --git a/tools/patman/patchstream.py b/tools/patman/patchstream.py
index 2439fb18e4..1da9d53b65 100644
--- a/tools/patman/patchstream.py
+++ b/tools/patman/patchstream.py
@@ -596,6 +596,8 @@ class PatchStream:
         # These seem like they would be nice to include.
         if 'prefix' in self.series:
             parts.append(self.series['prefix'])
+        if 'postfix' in self.series:
+            parts.append(self.serties['postfix'])
         if 'version' in self.series:
             parts.append("v%s" % self.series['version'])
 
diff --git a/tools/patman/series.py b/tools/patman/series.py
index 8ae218d3a4..da734d92cf 100644
--- a/tools/patman/series.py
+++ b/tools/patman/series.py
@@ -16,7 +16,7 @@ from patman import tools
 
 # Series-xxx tags that we understand
 valid_series = ['to', 'cc', 'version', 'changes', 'prefix', 'notes', 'name',
-                'cover_cc', 'process_log', 'links', 'patchwork_url']
+                'cover_cc', 'process_log', 'links', 'patchwork_url', 'postfix']
 
 class Series(dict):
     """Holds information about a patch series, including all tags.
@@ -133,6 +133,7 @@ class Series(dict):
             print('Cc:\t ', item)
         print('Version: ', self.get('version'))
         print('Prefix:\t ', self.get('prefix'))
+        print('Postfix:\t ', self.get('postfix'))
         if self.cover:
             print('Cover: %d lines' % len(self.cover))
             cover_cc = gitutil.BuildEmailList(self.get('cover_cc', ''))
@@ -322,4 +323,8 @@ class Series(dict):
         prefix = ''
         if self.get('prefix'):
             prefix = '%s ' % self['prefix']
-        return '%s%sPATCH%s' % (git_prefix, prefix, version)
+
+        postfix = ''
+        if self.get('postfix'):
+           postfix = ' %s' % self['postfix']
+        return '%s%sPATCH%s%s' % (git_prefix, prefix, postfix, version)
diff --git a/tools/patman/test/test01.txt b/tools/patman/test/test01.txt
index de2d9e4d28..fc3066e50b 100644
--- a/tools/patman/test/test01.txt
+++ b/tools/patman/test/test01.txt
@@ -44,6 +44,7 @@ Date:   Sat Apr 15 15:39:08 2017 -0600
     Signed-off-by: Simon Glass <sjg@chromium.org>
     Series-to: u-boot
     Series-prefix: RFC
+    Series-postfix: some-branch
     Series-cc: Stefan Brüns <stefan.bruens@rwth-aachen.de>
     Cover-letter-cc: Lord Mëlchett <clergy@palace.gov>
     Series-version: 3