diff --git a/src/immer.d.ts b/src/immer.d.ts
index 44bbf094..216a7259 100644
--- a/src/immer.d.ts
+++ b/src/immer.d.ts
@@ -157,9 +157,12 @@ export function applyPatches<S>(base: S, patches: Patch[]): S
 /** Get the underlying object that is represented by the given draft */
 export function original<T>(value: T): T | void
 
-/** For detecting an Immer draft */
+/** Returns true if the given value is an Immer draft */
 export function isDraft(value: any): boolean
 
+/** Returns true if the given value can be drafted by Immer */
+export function isDraftable(value: any): boolean
+
 export class Immer {
     constructor(config: {
         useProxies?: boolean
diff --git a/src/index.js b/src/index.js
index 990c0a9b..f864a225 100644
--- a/src/index.js
+++ b/src/index.js
@@ -50,6 +50,7 @@ export const applyPatches = produce(applyPatchesImpl)
 export {
     original,
     isDraft,
+    isDraftable,
     NOTHING as nothing,
     DRAFTABLE as immerable
 } from "./common"