diff --git a/README.md b/README.md
index e95bfa0a..55cd8136 100644
--- a/README.md
+++ b/README.md
@@ -236,7 +236,8 @@ If you have an error above, here is temporary fix:
 
 ### React Native
 
-React Native does not have built-in random generator.
+React Native does not have built-in random generator. The following polyfill works for plain React
+Native and Expo starting with v39.
 
 1. Check [`react-native-get-random-values`] docs and install it.
 2. Import it before Nano ID.
@@ -253,7 +254,7 @@ For Expo framework see the next section.
 
 ### Expo
 
-If you use Expo in React Native, you need a different workaround.
+If you use Expo prior to v39 in React Native, you need a different workaround.
 
 1. Install [`expo-random`](https://www.npmjs.com/package/expo-random).
 2. Use `nanoid/async` instead of `nanoid`.
diff --git a/package.json b/package.json
index ed6bf3c6..d82d54e8 100644
--- a/package.json
+++ b/package.json
@@ -193,7 +193,9 @@
       "Rollup",
       "transpile",
       "workaround",
-      "Deno"
+      "Deno",
+      "polyfill",
+      "v39"
     ]
   },
   "sharec": {