diff --git a/README.md b/README.md
index b79de12..14a7877 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ This module adds an API for running environment checks to your API.
 Almost, but not really. Environment checks differ from unit tests in two important ways:
 
  * **They test environment specific settings.** Unit tests are designed to use dummy data and mock interfaces to external system.  Environment checks check the real systems and data that the given environment is actually connected to.
- * **They can't modify data.** Because these checks will run using production databases, they can't go modifying the data in there. This is the biggest reason why we haven't used the same base class as a unit test for writing environment checks - we wanted to make it impossible to accidentally plug the a unit test into the environment checker!
+ * **They can't modify data.** Because these checks will run using production databases, they can't go modifying the data in there. This is the biggest reason why we haven't used the same base class as a unit test for writing environment checks - we wanted to make it impossible to accidentally plug a unit test into the environment checker!
 
 ## Adding more checks