diff --git a/CHANGES.rst b/CHANGES.rst
index 6a179bdf..c535a997 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -57,6 +57,9 @@ Unreleased
 .. _#3179: https://github.com/pallets/flask/pull/3179
 .. _#3125: https://github.com/pallets/flask/pull/3125
 
+-   Added support to ``extra_files`` argument in `flask run` CLI. (`#2898`_)
+
+.. _#2898: https://github.com/pallets/flask/pull/2898
 
 Version 1.0.3
 -------------
@@ -87,7 +90,6 @@ Released 2019-05-17
 .. _#2933: https://github.com/pallets/flask/issues/2933
 .. _#2986: https://github.com/pallets/flask/pull/2986
 
-
 Version 1.0.2
 -------------
 
diff --git a/docs/cli.rst b/docs/cli.rst
index 5835d74b..3879f6ee 100644
--- a/docs/cli.rst
+++ b/docs/cli.rst
@@ -202,6 +202,20 @@ command, instead of ``flask run --port 8000``:
 These can be added to the ``.flaskenv`` file just like ``FLASK_APP`` to
 control default command options.
 
+To define a list of files the reloader should watch additionally to the modules
+as in ``extra_files`` argument used in the ``app.run`` and ``werkzeug.serving.run_simple``
+you can either use the ``--extra-files`` (or multiple ``-f``) option or define the
+``FLASK_RUN_EXTRA_FILES`` environment variable.
+
+.. code-block:: none
+
+    # on windows use ``;`` instead of ``:`` to separate paths
+    export FLASK_RUN_EXTRA_FILES=/path/to/file1:/path/to/file2
+    flask run
+     * Running on http://127.0.0.1:8000/
+     * Detected change in '/path/to/file1', reloading
+
+On command line the same can be achieved with ``flask run -f /path/to/file1 -f /path/to/file2``.
 
 Disable dotenv
 ~~~~~~~~~~~~~~
diff --git a/flask/cli.py b/flask/cli.py
index 7d882902..214eb601 100644
--- a/flask/cli.py
+++ b/flask/cli.py
@@ -778,8 +778,12 @@ def _validate_key(ctx, param, value):
     default=True,
     help="Enable or disable multithreading.",
 )
+@click.option('--extra-files', '-f',
+              multiple=True, default=None, type=click.Path(),
+              help='Files reloader should watch additionally to the modules')
 @pass_script_info
-def run_command(info, host, port, reload, debugger, eager_loading, with_threads, cert):
+def run_command(info, host, port, reload, debugger, eager_loading,
+                with_threads, cert, extra_files):
     """Run a local development server.
 
     This server is for development purposes only. It does not provide
@@ -812,6 +816,7 @@ def run_command(info, host, port, reload, debugger, eager_loading, with_threads,
         use_debugger=debugger,
         threaded=with_threads,
         ssl_context=cert,
+        extra_files=extra_files
     )