Update Modern-TestingRelayComponents.md
Summary: Pull Request resolved:
@@ -23,7 +23,7 @@ And it's not always easy to understand the mechanics of all processes that are h
Fortunately, we have tools that aim to simplify the process of writing tests for Relay components, by providing imperative APIs for controlling the request/response flow and additional API for mock data generation.
-There are two main modules that you may using in your tests:
+There are two main modules that you may use in your tests:
* createMockEnvironment(options): RelayMockEnvironment
* MockPayloadGenerator and @relay_test_operation directive
