diff --git a/test/testHelpers/apolloTestServerHelpers.ts b/test/testHelpers/apolloTestServerHelpers.ts
index e92dd86..a8af9d4 100644
--- a/test/testHelpers/apolloTestServerHelpers.ts
+++ b/test/testHelpers/apolloTestServerHelpers.ts
@@ -17,6 +17,10 @@ function setUpTestServer() {
   });
 }
 
+/**
+ * Returns a `ServerContext` object which can be passed to requests
+ * for testing.
+ */
 export function setupTestServerContext() {
   const context: { [key: string] : any } = {};