diff --git a/development-101.md b/development-101.md
index 112dd32..1b68784 100644
--- a/development-101.md
+++ b/development-101.md
@@ -16,7 +16,7 @@ During development you may find yourself having to enter your briar password ver
 Running two versions of Briar side by side on one device does not work out
 of the box. For example it is not possible to run the released version and
 the development version at the same time; only one of both will be online.
-The reason is that the both versions are trying to use the same hard-coded
+The reason is that both versions are trying to use the same hard-coded
 Tor ports to create their hidden service, which doesn't work. The solution
 is to use different ports on the development versions. To do so, change the
 following: