diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..539da74
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.py[co]
diff --git a/mdc.py b/mdc.py
index 689ee8b..ead873b 100644
--- a/mdc.py
+++ b/mdc.py
@@ -4,6 +4,10 @@ BROADCAST = 0xfe
 
 
 class MDC(serial.Serial):
+    """Samsung 400MX MDC remote control client
+
+    Docs: https://www.samsung.com/us/pdf/MDC_400DXn460DXn570DXn700DXn820DXn460TXn_v1.pdf
+    """
     def command(self, command, data=[], target_id=BROADCAST):
         if target_id == 0:
             target_id = 0xff