diff --git a/DEV_ENVIRONMENT.md b/DEV_ENVIRONMENT.md
index 7192cc30a0a..f9ed50cd2ef 100644
--- a/DEV_ENVIRONMENT.md
+++ b/DEV_ENVIRONMENT.md
@@ -25,5 +25,5 @@ To run lint, run `gulp lint`.
 ### Running benchmarks
 Not yet implemented.
 
-### Running screenshot diff tests.
+### Running screenshot diff tests
 Not yet implemented.