diff --git a/types/frisby/index.d.ts b/types/frisby/index.d.ts
index 366a3998d7..9057edae6d 100644
--- a/types/frisby/index.d.ts
+++ b/types/frisby/index.d.ts
@@ -18,16 +18,27 @@ export import Joi = require("joi");
 
 // #region Frisby FrisbySpec Methods
 // Reference file: https://github.com/vlucas/frisby/blob/master/src/frisby/spec.js
+
+// **************************************CHANGE LOG**************************************
+// C.E.W. This is an attempt to create some sort of changelog for these types.
+// If you make any changes, please try and note those changes in this section.
+// If this section gets too long we can always trim it.
+// ## 2018-03-05
+// ### Changed
+// - Update _Frisbyspec.get_, _Frisbyspec.post_, _Frisbyspec.put_, _Frisbyspec.del_, _Frisbyspec.patch_,  _Frisbyspec.fetch_ to allow _params_ to be optional.
+// - Update _FrisbySpec.then_ to allow _onRejected_ to be optional.
+// **************************************CHANGE LOG**************************************
+
 export class FrisbySpec {
     constructor(...args: any[]);
     catch(onRejected?: (error: Error) => void): FrisbySpec;
-    del(url: string, params: {}): FrisbySpec;
+    del(url: string, params?: {}): FrisbySpec;
     done(doneFn: (...args: any[]) => void): FrisbySpec;
     expect(expectName: string, ...args: any[]): FrisbySpec;
     expectNot(expectName: string): FrisbySpec;
-    fetch(url: string, params: {}, options?: {}): FrisbySpec;
+    fetch(url: string, params?: {}, options?: {}): FrisbySpec;
     fromJSON(json: {}): FrisbySpec;
-    get(url: string, params: {}): FrisbySpec;
+    get(url: string, params?: {}): FrisbySpec;
     getBaseUrl(): string | boolean;
     inspectBody(): FrisbySpec;
     inspectHeaders(): FrisbySpec;
@@ -37,12 +48,12 @@ export class FrisbySpec {
     inspectRequestHeaders(): FrisbySpec;
     inspectResponse(): FrisbySpec;
     inspectStatus(): FrisbySpec;
-    patch(url: string, params: {}): FrisbySpec;
-    post(url: string, params: {}): FrisbySpec;
+    patch(url: string, params?: {}): FrisbySpec;
+    post(url: string, params?: {}): FrisbySpec;
     promise(): Promise<nodeFetch.Response>;
-    put(url: string, params: {}): FrisbySpec;
+    put(url: string, params?: {}): FrisbySpec;
     setup(opts: {}, replace: boolean): FrisbySpec;
-    then(onFulfilled: {} | ((...args: any[]) => void), onRejected: (...args: any[]) => void): FrisbySpec;
+    then(onFulfilled: {} | ((...args: any[]) => void), onRejected?: (...args: any[]) => void): FrisbySpec;
     timeout(timeout: number): number;
     use(fn: (...args: any[]) => void): FrisbySpec;
     static addExpectHandler(expectName: string, expectFn: (...args: any[]) => any): void;