diff --git a/docs/modules/Reader.ts.md b/docs/modules/Reader.ts.md
index 81ba06606..934796906 100644
--- a/docs/modules/Reader.ts.md
+++ b/docs/modules/Reader.ts.md
@@ -202,7 +202,7 @@ Added in v2.0.0
 **Signature**
 
 ```ts
-export declare const promap: <E, A, D, B>(f: (d: D) => E, g: (a: A) => B) => (fbc: Reader<E, A>) => Reader<D, B>
+export declare const promap: <E, A, D, B>(f: (d: D) => E, g: (a: A) => B) => (fea: Reader<E, A>) => Reader<D, B>
 ```
 
 Added in v2.0.0