diff --git a/tests/test-treemanifest-treeonly.t b/tests/test-treemanifest-treeonly.t
--- a/tests/test-treemanifest-treeonly.t
+++ b/tests/test-treemanifest-treeonly.t
@@ -190,7 +190,7 @@
   $ echo x >> subdir/x
   $ hg commit -qAm 'modify subdir/x'
   $ hg log -r tip -T '{manifest}'
-  1:d9920715ba88 (no-eol)
+  d9920715ba88cbc7962c4dac9f20004aafd94ac8 (no-eol)
 
   $ cd ../client
   $ hg pull
@@ -254,6 +254,10 @@
   |
   ~
 
+Test {manifest} template
+  $ hg log -r . -T '{manifest}'
+  0ab0ab59dd6ab41bda558ad2fd4c665da69323ab (no-eol)
+
 Test turning treeonly off and making sure we can still commit on top of treeonly
 commits
   $ echo >> subdir/x
diff --git a/tests/test-treemanifest.t b/tests/test-treemanifest.t
--- a/tests/test-treemanifest.t
+++ b/tests/test-treemanifest.t
@@ -118,8 +118,8 @@
   rebasing 4:f096b21e165f "modify subdir/y again" (tip)
   saved backup bundle to $TESTTMP/client/.hg/strip-backup/6a2476258ba5-a90056a1-rebase.hg (glob)
   $ hg log -r '.^::.' -T '{manifest}\n'
-  3:0d05c20bb7eb
-  4:8289b85c6a30
+  0d05c20bb7eb53dbfe91f834ed3f0c26ca6ca655
+  8289b85c6a307a5a64ffe3bd80bd7998775c787a
   $ hg debugdatapack .hg/store/packs/manifests/5a5fb42e99986c90ac86b57d184561c44238b7b7.datapack
   .hg/store/packs/manifests/5a5fb42e99986c90ac86b57d184561c44238b7b7:
   subdir:
diff --git a/treemanifest/__init__.py b/treemanifest/__init__.py
--- a/treemanifest/__init__.py
+++ b/treemanifest/__init__.py
@@ -82,6 +82,7 @@
     repair,
     revlog,
     sshserver,
+    templatekw,
     util,
     wireproto,
 )
@@ -153,6 +154,16 @@
     extensions.wrapfunction(bundle2, 'getrepocaps', getrepocaps)
     _registerbundle2parts()
 
+    extensions.wrapfunction(templatekw, 'showmanifest', showmanifest)
+    templatekw.keywords['manifest'] = templatekw.showmanifest
+
+def showmanifest(orig, **args):
+    # The normal manifest template shows a rev number, which we don't have.
+    # Let's just print the node. Note, this breaks the ability for us to do
+    # '{manifest % "{node} {rev}"}' but that's fine, since we can only show
+    # the node now anyway.
+    return hex(args[r'ctx'].manifestnode())
+
 def getrepocaps(orig, repo, *args, **kwargs):
     caps = orig(repo, *args, **kwargs)
     if treeenabled(repo.ui):