diff --git a/src/index.js b/src/index.js
index 7487e823ad..c7d8aacb1e 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,3 +1,4 @@
+// @flow strict
 export { default as unstable_createElement } from './exports/createElement';
 export { default as findNodeHandle } from './exports/findNodeHandle';
 export { default as processColor } from './exports/processColor';