diff --git a/README.md b/README.md
index 8596ee0..6371c83 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ Usage
 
 ### Linux
 
+    pip install -r requirements.txt
     python wattsup.py -p /dev/ttyUSBX -i
     python wattsup.py --help
 
@@ -18,6 +19,7 @@ Usage
 
 Install the http://www.ftdichip.com/Drivers/VCP.htm drivers. Restart.
 
+    port install py-serial
     python wattsup.py -p /dev/tty.usbserial-X -i
 
 
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..f6c1a1f
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+pyserial
diff --git a/wattsup.py b/wattsup.py
index 2b48bad..f14d401 100755
--- a/wattsup.py
+++ b/wattsup.py
@@ -1,12 +1,8 @@
 #!/usr/bin/env python3
 
+import serial
+
 import sys
-try:
-    import serial
-except ImportError:
-    print('Need serial package.')
-    print('sudo port install py-serial')
-    sys.exit(1)
 import os
 import datetime, time
 import argparse