diff --git a/doc/tutorial/source/building-topologies.rst b/doc/tutorial/source/building-topologies.rst
index 918c75cd5..747e3a7f9 100644
--- a/doc/tutorial/source/building-topologies.rst
+++ b/doc/tutorial/source/building-topologies.rst
@@ -167,7 +167,7 @@ rate is specified by a *channel* ``Attribute`` instead of a device
 for example, 10Base-T and 100Base-T devices on a given channel.  We first set 
 the data rate to 100 megabits per second, and then set the speed-of-light delay
 of the channel to 6560 nano-seconds (arbitrarily chosen as 1 nanosecond per foot
-over a 100 meter segment).  Notice that you can set an ``Attribute`` using 
+over a 2000 meter segment).  Notice that you can set an ``Attribute`` using 
 its native data type.
 
 ::