diff --git a/src/locations.js b/src/locations.js
index 913c40d..2749890 100644
--- a/src/locations.js
+++ b/src/locations.js
@@ -37,7 +37,7 @@ class Locations {
 	/**
 	 * Load all of sections in the book to generate locations
 	 * @param  {int} chars how many chars to split on
-	 * @return {object} locations
+	 * @return {Promise<Array<string>>} locations
 	 */
 	generate(chars) {
 
diff --git a/types/locations.d.ts b/types/locations.d.ts
index be314da..1f0de6a 100644
--- a/types/locations.d.ts
+++ b/types/locations.d.ts
@@ -5,13 +5,13 @@ import EpubCFI from "./epubcfi";
 export default class Locations {
   constructor(spine: Spine, request?: Function, pause?: number);
 
-  generate(chars: number): object;
+  generate(chars: number): Promise<Array<string>>;
 
   process(section: Section): Promise<Array<string>>;
 
-	locationFromCfi(cfi: string | EpubCFI): Location;
+  locationFromCfi(cfi: string | EpubCFI): Location;
 
-	percentageFromCfi(cfi: string | EpubCFI): number;
+  percentageFromCfi(cfi: string | EpubCFI): number;
 
   percentageFromLocation(loc: number): number;
 
@@ -19,7 +19,7 @@ export default class Locations {
 
   cfiFromPercentage(percentage: number): string;
 
-	load(locations: string): Array<string>;
+  load(locations: string): Array<string>;
 
   save(): string;