diff --git a/README.md b/README.md
index 23ee427..9ad5695 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ Designed for dynamic alias based workflow where a different alias is used for ea
  1. [Build](#building-from-source) / Download latest release - `mail4one.pyz`
  1. Generate `config.json` from [config.sample](deploy_configs/config.sample)
  1. Run `./mail4one.pyz -c config.json`
- 1. [Optional] Setup systemd service and TLS certificates. See [deploy_configs](deploy_configs/) for examples
+ 1. Setup systemd service and TLS certificates. See [deploy_configs](deploy_configs/) for examples
 
 # Sending email
 
diff --git a/mail4one/pop3.py b/mail4one/pop3.py
index 5b993ae..3214ce9 100644
--- a/mail4one/pop3.py
+++ b/mail4one/pop3.py
@@ -116,8 +116,8 @@ async def expect_cmd(*commands: Command) -> Request:
     return req
 
 
-def write(data) -> None:
-    logger.debug(f"Server: {data}")
+def write(data: bytes) -> None:
+    logger.debug(f"Server: {data!r}")
     state().writer.write(data)