diff --git a/dockerpty/io.py b/dockerpty/io.py
index 06282b5..ac2beda 100644
--- a/dockerpty/io.py
+++ b/dockerpty/io.py
@@ -243,7 +243,7 @@ class Pump(object):
     """
     Stream pump class.
 
-    A Pump wraps two Streams, reading from one and and writing its data into
+    A Pump wraps two Streams, reading from one and writing its data into
     the other, much like a pipe but manually managed.
 
     This abstraction is used to facilitate piping data between the file