diff --git a/src/pycalver/vcs.py b/src/pycalver/vcs.py
index 9176a81..816ea94 100644
--- a/src/pycalver/vcs.py
+++ b/src/pycalver/vcs.py
@@ -42,7 +42,7 @@ VCS_SUBCOMMANDS_BY_NAME = {
         'ls_tags'     : "hg tags",
         'status'      : "hg status -mard",
         'add_path'    : "hg add {path}",
-        'commit'      : "hg commit --logfile",
+        'commit'      : "hg commit --logfile {path}",
         'tag'         : "hg tag {tag} --message {tag}",
         'push_tag'    : "hg push {tag}",
         'show_remotes': "hg paths",
@@ -122,7 +122,14 @@ class VCS:
     def add(self, path: str) -> None:
         """Add updates to be included in next commit."""
         log.info(f"{self.name} add {path}")
-        self('add_path', path=path)
+        try:
+            self('add_path', path=path)
+        except sp.CalledProcessError as ex:
+            if "already tracked!" in str(ex):
+                # mercurial
+                return
+            else:
+                raise
 
     def commit(self, message: str) -> None:
         """Commit added files."""
diff --git a/test/test_cli.py b/test/test_cli.py
index b287a0d..1ee3413 100644
--- a/test/test_cli.py
+++ b/test/test_cli.py
@@ -1,5 +1,6 @@
 import os
 import io
+import time
 import shutil
 import pathlib2 as pl
 import subprocess as sp
@@ -34,11 +35,15 @@ requires = ["setuptools", "wheel"]
 def runner(tmpdir):
     runner   = CliRunner()
     orig_cwd = os.getcwd()
+    os.environ['GIT_AUTHOR_NAME' ] = "pycalver_tester"
+    os.environ['GIT_AUTHOR_EMAIL'] = "pycalver_tester@nowhere.com"
+    os.environ['HGUSER'          ] = "pycalver_tester"
 
     _debug = 0
     if _debug:
         tmpdir = pl.Path("..") / "tmp_test_pycalver_project"
         if tmpdir.exists():
+            time.sleep(0.2)
             shutil.rmtree(str(tmpdir))
         tmpdir.mkdir()
 
@@ -306,3 +311,20 @@ def test_git_bump(runner):
     with io.open("README.md") as fh:
         content = fh.read()
         assert calver + ".0002-alpha !\n" in content
+
+
+def test_hg_bump(runner):
+    _add_project_files("README.md")
+    _vcs_init("hg")
+
+    result = runner.invoke(pycalver.cli, ['init', "--verbose"])
+    assert result.exit_code == 0
+
+    result = runner.invoke(pycalver.cli, ['bump', "--verbose"])
+    assert result.exit_code == 0
+
+    calver = config._initial_version()[:7]
+
+    with io.open("README.md") as fh:
+        content = fh.read()
+        assert calver + ".0002-alpha !\n" in content