diff --git a/borgmatic/borg/create.py b/borgmatic/borg/create.py
index 85f7e042..f2f23c69 100644
--- a/borgmatic/borg/create.py
+++ b/borgmatic/borg/create.py
@@ -198,6 +198,7 @@ def make_base_create_command(  # noqa: PLR0912
     umask = config.get('umask', None)
     lock_wait = config.get('lock_wait', None)
     list_filter_flags = flags.make_list_filter_flags(local_borg_version, dry_run)
+    files_changed = config.get('files_changed')
     files_cache = config.get('files_cache')
     archive_name_format = (
         config.get('archive_name_format', flags.get_default_archive_name_format(local_borg_version))
@@ -248,6 +249,7 @@ def make_base_create_command(  # noqa: PLR0912
         + (('--nobirthtime',) if config.get('birthtime') is False else ())
         + (('--read-special',) if config.get('read_special') or stream_processes else ())
         + noflags_flags
+        + (('--files-changed', files_changed) if files_changed else ())
         + (('--files-cache', files_cache) if files_cache else ())
         + (('--remote-path', remote_path) if remote_path else ())
         + (('--umask', str(umask)) if umask else ())
diff --git a/borgmatic/config/schema.yaml b/borgmatic/config/schema.yaml
index e29c1e58..f339ce0d 100644
--- a/borgmatic/config/schema.yaml
+++ b/borgmatic/config/schema.yaml
@@ -166,6 +166,14 @@ properties:
             Record filesystem flags (e.g. NODUMP, IMMUTABLE) in archive.
             Defaults to true.
         example: false
+    files_changed:
+        type: string
+        description: |
+            Threshold for considering a file as changed. See
+            https://borgbackup.readthedocs.io/en/stable/usage/create.html for
+            details. Defaults to "mtime" (i.e., a file is considered
+            changed if its mtime has changed since the last backup).
+        example: mtime,size
     files_cache:
         type: string
         description: |
diff --git a/tests/unit/borg/test_create.py b/tests/unit/borg/test_create.py
index e85b1479..969b707e 100644
--- a/tests/unit/borg/test_create.py
+++ b/tests/unit/borg/test_create.py
@@ -482,6 +482,7 @@ def test_make_base_create_command_with_store_config_false_omits_config_files():
         ('flags', True, False, ()),
         ('flags', False, True, ('--noflags',)),
         ('flags', False, False, ('--nobsdflags',)),
+        ('files_changed', 'mtime', True, ('--files-changed', 'mtime')),
         ('files_cache', 'ctime,size', True, ('--files-cache', 'ctime,size')),
         ('umask', 740, True, ('--umask', '740')),
         ('lock_wait', 5, True, ('--lock-wait', '5')),