diff --git a/src/React.re b/src/React.re
index cb2ef44f7..e8c9c7fc4 100644
--- a/src/React.re
+++ b/src/React.re
@@ -872,10 +872,15 @@ module Uncurried = {
     "useCallback";
 };
 
+type callback('input, 'output) = 'input => 'output;
+
 [@mel.module "react"]
 external useTransition: unit => (bool, callback(callback(unit, unit), unit)) =
   "useTransition";
 
+[@mel.module "react"]
+external startTransition: ([@mel.uncurry] (unit => unit)) => unit = "startTransition";
+
 [@mel.module "react"]
 external useDebugValue: ('value, ~format: 'value => string=?, unit) => unit =
   "useDebugValue";
diff --git a/src/React.rei b/src/React.rei
index d939f38d7..c7664b2ba 100644
--- a/src/React.rei
+++ b/src/React.rei
@@ -564,6 +564,9 @@ module Uncurried: {
     "useCallback";
 };
 
+[@mel.module "react"]
+external startTransition: ([@mel.uncurry] (unit => unit)) => unit = "startTransition";
+
 [@mel.module "react"]
 external useTransition: unit => (bool, callback(callback(unit, unit), unit)) =
   "useTransition";