diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6eb6aed8947..57b288f67e9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,21 +6,21 @@
 
 ### 🐞 Bug fixes
 
-- *...Add fixed bugs here...*
+- Add void return for some method declaration to match TS strict mode (#194)
 
 ## 1.15.0
 
 ### Features and improvements
 
-- ** Breaking Change: ** Rename css classes ((#83)[https://github.com/maplibre/maplibre-gl-js/issues/83])
-- Added custom protocol support to allow overriding ajax calls ((#29)[https://github.com/maplibre/maplibre-gl-js/issues/29])
+- ** Breaking Change: ** Rename css classes (#83)
+- Added custom protocol support to allow overriding ajax calls (#29)
 - Added setTransformRequest to map (#159)
 - Publish @maplibre/maplibre-gl-style-spec v14.0.0 on NPM (#149)
 - Replace link to mapbox on LogoControl by link to maplibre (#151)
 - Migrate style spec files from mapbox to maplibre (#147)
 - Publish the MapLibre style spec in NPM (#140)
 - Replace mapboxgl with maplibregl in JSDocs inline examples (#134)
-- Bring in typescript definitions file (#24) 
+- Bring in typescript definitions file (#24)
 - Update example links to https://maplibre.org/maplibre-gl-js-docs/ (#131)
 - Improve performance of layers with constant `*-sort-key` (#78)
 
diff --git a/src/index.d.ts b/src/index.d.ts
index b71cf2899b6..4afb3f14bc4 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -73,14 +73,14 @@ declare namespace maplibregl {
      *      return { cancel: () => { } };
      * });
      */
-    export function addProtocol(customProtocol: string, loadFn: (requestParameters: RequestParameters, callback: ResponseCallback<any>) => Cancelable);
+    export function addProtocol(customProtocol: string, loadFn: (requestParameters: RequestParameters, callback: ResponseCallback<any>) => Cancelable): void;
     /**
      * Removes a previusly added protocol
      * @param {string} customProtocol - the custom protocol to remove registration for
      * @example
      * maplibregl.removeProtocol('custom');
      */
-    export function removeProtocol(customProtocol: string);
+    export function removeProtocol(customProtocol: string): void;
 
     export function setRTLTextPlugin(pluginURL: string, callback: (error: Error) => void, deferred?: boolean): void;
     export function getRTLTextPluginStatus(): PluginStatus;