diff --git a/README.md b/README.md
index eb85bd5..1ca25e7 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,17 @@
 # MyFTP
+
+## Dependencies
+
+Zero. Only python standard libs were used.
+
+## Running
+
+### Client
+
+You can run `python3 src/myftp/client.py` to start the client or `python3 src/myftp/client.py --debug 1` for debugging purposes.
+
+### Server
+
+By default, the server IP address or hostname or server name will be `127.0.0.1` (also known as `localhost`). The `--port_number` flag, if not specified will be by default `12000`.
+
+You can run `python3 src/myftp/server.py` to start the server or `python3 src/myftp/server.py --port_number <insert port number here> --debug 1` for debugging purposes and to specify the port number.
diff --git a/src/myftp/server.py b/src/myftp/server.py
index 667478c..8270833 100644
--- a/src/myftp/server.py
+++ b/src/myftp/server.py
@@ -47,7 +47,11 @@ def init():
     parser = ArgumentParser(description="A FTP server written in Python")
 
     parser.add_argument(
-        "port_number", type=int, help="Port number for the server. Default = 12000"
+        "--port_number",
+        default=12000,
+        required=False,
+        type=int,
+        help="Port number for the server. Default = 12000",
     )
 
     parser.add_argument(