diff --git a/NEWS b/NEWS
index 7a5cfa81..0d2507c1 100644
--- a/NEWS
+++ b/NEWS
@@ -23,6 +23,8 @@
    https://torsion.org/borgmatic/docs/how-to/backup-your-databases/#containers
  * #1037: Fix an error with the "extract" action when both a remote repository and a
    "working_directory" are used.
+ * #1044: Fix an error in the systemd credential hook when the credential name contains a "."
+   character.
 
 1.9.14
  * #409: With the PagerDuty monitoring hook, send borgmatic logs to PagerDuty so they show up in the
diff --git a/borgmatic/hooks/credential/systemd.py b/borgmatic/hooks/credential/systemd.py
index 1de245a3..9cce0d7b 100644
--- a/borgmatic/hooks/credential/systemd.py
+++ b/borgmatic/hooks/credential/systemd.py
@@ -5,7 +5,7 @@ import re
 logger = logging.getLogger(__name__)
 
 
-CREDENTIAL_NAME_PATTERN = re.compile(r'^\w+$')
+CREDENTIAL_NAME_PATTERN = re.compile(r'^[\w.-]+$')
 
 
 def load_credential(hook_config, config, credential_parameters):
diff --git a/docs/Dockerfile b/docs/Dockerfile
index c3279570..afa3457d 100644
--- a/docs/Dockerfile
+++ b/docs/Dockerfile
@@ -4,7 +4,7 @@ COPY . /app
 RUN apk add --no-cache py3-pip py3-ruamel.yaml py3-ruamel.yaml.clib
 RUN pip install --break-system-packages --no-cache /app && borgmatic config generate && chmod +r /etc/borgmatic/config.yaml
 RUN borgmatic --help > /command-line.txt \
-    && for action in repo-create transfer create prune compact check delete extract config "config bootstrap" "config generate" "config validate" export-tar mount umount repo-delete restore repo-list list repo-info info break-lock "key export" "key change-passphrase" borg; do \
+    && for action in repo-create transfer create prune compact check delete extract config "config bootstrap" "config generate" "config validate" export-tar mount umount repo-delete restore repo-list list repo-info info break-lock "key export" "key import" "key change-passphrase" borg; do \
            echo -e "\n--------------------------------------------------------------------------------\n" >> /command-line.txt \
            && borgmatic $action --help >> /command-line.txt; done
 RUN /app/docs/fetch-contributors >> /contributors.html
diff --git a/docs/how-to/snapshot-your-filesystems.md b/docs/how-to/snapshot-your-filesystems.md
index 8dd8bad5..018e6553 100644
--- a/docs/how-to/snapshot-your-filesystems.md
+++ b/docs/how-to/snapshot-your-filesystems.md
@@ -148,9 +148,9 @@ feedback](https://torsion.org/borgmatic/#issues) you have on this feature.
 
 #### Subvolume discovery
 
-For any read-write subvolume you'd like backed up, add its path to borgmatic's
-`source_directories` option. Btrfs does not support snapshotting read-only
-subvolumes.
+For any read-write subvolume you'd like backed up, add its mount point path to
+borgmatic's `source_directories` option. Btrfs does not support snapshotting
+read-only subvolumes.
 
 <span class="minilink minilink-addedin">New in version 1.9.6</span> Or include
 the mount point as a root pattern with borgmatic's `patterns` or `patterns_from`
@@ -161,27 +161,27 @@ includes the snapshotted files in the paths sent to Borg. borgmatic is also
 responsible for cleaning up (deleting) these snapshots after a backup completes.
 
 borgmatic is smart enough to look at the parent (and grandparent, etc.)
-directories of each of your `source_directories` to discover any subvolumes.
-For instance, let's say you add `/var/log` and `/var/lib` to your source
-directories, but `/var` is a subvolume. borgmatic will discover that and
-snapshot `/var` accordingly. This also works even with nested subvolumes;
+directories of each of your `source_directories` to discover any subvolumes. For
+instance, let's say you add `/var/log` and `/var/lib` to your source
+directories, but `/var` is a subvolume mount point. borgmatic will discover that
+and snapshot `/var` accordingly. This also works even with nested subvolumes;
 borgmatic selects the subvolume that's the "closest" parent to your source
 directories.
 
 <span class="minilink minilink-addedin">New in version 1.9.6</span> When using
 [patterns](https://borgbackup.readthedocs.io/en/stable/usage/help.html#borg-help-patterns),
 the initial portion of a pattern's path that you intend borgmatic to match
-against a subvolume can't have globs or other non-literal characters in it—or it
-won't actually match. For instance, a subvolume of `/var` would match a pattern
-of `+ fm:/var/*/data`, but borgmatic isn't currently smart enough to match
-`/var` to a pattern like `+ fm:/v*/lib/data`.
+against a subvolume mount point can't have globs or other non-literal characters
+in it—or it won't actually match. For instance, a subvolume mount point of
+`/var` would match a pattern of `+ fm:/var/*/data`, but borgmatic isn't
+currently smart enough to match `/var` to a pattern like `+ fm:/v*/lib/data`.
 
-Additionally, borgmatic rewrites the snapshot file paths so that they appear
-at their original subvolume locations in a Borg archive. For instance, if your
-subvolume exists at `/var/subvolume`, then the snapshotted files will appear
+Additionally, borgmatic rewrites the snapshot file paths so that they appear at
+their original subvolume locations in a Borg archive. For instance, if your
+subvolume is mounted at `/var/subvolume`, then the snapshotted files will appear
 in an archive at `/var/subvolume` as well—even if borgmatic has to mount the
-snapshot somewhere in `/var/subvolume/.borgmatic-snapshot-1234/` to perform
-the backup.
+snapshot somewhere in `/var/subvolume/.borgmatic-snapshot-1234/` to perform the
+backup.
 
 <span class="minilink minilink-addedin">With Borg version 1.2 and
 earlier</span>Snapshotted files are instead stored at a path dependent on the
diff --git a/tests/unit/hooks/credential/test_systemd.py b/tests/unit/hooks/credential/test_systemd.py
index 603c8569..32133883 100644
--- a/tests/unit/hooks/credential/test_systemd.py
+++ b/tests/unit/hooks/credential/test_systemd.py
@@ -42,12 +42,12 @@ def test_load_credential_reads_named_credential_from_file():
         '/var'
     )
     credential_stream = io.StringIO('password')
-    credential_stream.name = '/var/mycredential'
+    credential_stream.name = '/var/borgmatic.pw'
     builtins = flexmock(sys.modules['builtins'])
-    builtins.should_receive('open').with_args('/var/mycredential').and_return(credential_stream)
+    builtins.should_receive('open').with_args('/var/borgmatic.pw').and_return(credential_stream)
 
     assert (
-        module.load_credential(hook_config={}, config={}, credential_parameters=('mycredential',))
+        module.load_credential(hook_config={}, config={}, credential_parameters=('borgmatic.pw',))
         == 'password'
     )