diff --git a/src/interfaces/IManifest.ts b/src/interfaces/IManifest.ts
new file mode 100644
index 0000000..20794dc
--- /dev/null
+++ b/src/interfaces/IManifest.ts
@@ -0,0 +1,16 @@
+/** A patch manifest, containing a list of releases, how to patch them, and which the current release is. */
+export default interface IManifest {
+  /** Current release. */
+  current: number;
+  /** List of releases. */
+  releases: {
+    [s: string]: {
+      /** SHA1 hash of this release. */
+      sha1: string;
+      /** List of releases from where we can patch to this release. */
+      from: number[];
+      /** List of releases that this release can be patched to. */
+      to: number[];
+  };
+};
+}
diff --git a/src/ssn/getPatchmanifest.ts b/src/ssn/getPatchmanifest.ts
index f338a86..6d012df 100644
--- a/src/ssn/getPatchmanifest.ts
+++ b/src/ssn/getPatchmanifest.ts
@@ -1,6 +1,7 @@
 import { TextDecoder } from 'util';
 import * as xmlJs from 'xml-js';
 import getUrlContents from '../cdn/getUrlContents';
+import IManifest from '../interfaces/IManifest';
 import { Product } from '../interfaces/ISettings';
 import parsePatchmanifest from '../ssn/parsePatchmanifest';
 import verifyPatchmanifest from '../ssn/verifyPatchmanifest';
@@ -10,7 +11,7 @@ import readSsnFile from './readSsnFile';
 
 const Decoder = new TextDecoder('utf-8');
 
-export default async function getPatchmanifest(product: Product): Promise<any> {
+export default async function getPatchmanifest(product: Product): Promise<IManifest> {
   //Verify function arguments
   if (!verifyProductName(product)) {
     throw new Error(`"${product}" is not a valid product.`);
diff --git a/src/ssn/parsePatchmanifest.ts b/src/ssn/parsePatchmanifest.ts
index baef51b..8088a30 100644
--- a/src/ssn/parsePatchmanifest.ts
+++ b/src/ssn/parsePatchmanifest.ts
@@ -1,7 +1,8 @@
+import IManifest from '../interfaces/IManifest';
 
 /** Receives a JSON-converted version of the manifest.xml file, and returns an easier to read JSON file */
-export default function parsePatchManifest(manifestFile: any): any {
-  const out: any = {};
+export default function parsePatchManifest(manifestFile: any): IManifest {
+  const out: IManifest = { current: -1, releases: {} };
 
   const PatchManifest = manifestFile.elements[0];
 
@@ -11,21 +12,22 @@ export default function parsePatchManifest(manifestFile: any): any {
 
   //<Releases><Release><Id>0</Id><SHA1>53678f8057e52896a8145dca5c188ab3f24fa55f</SHA1></Release></Releases>
   const Releases = PatchManifest.elements[7];
-  out.releases = {};
   Releases.elements.forEach((Release: any) => {
     const id = Release.elements[0].elements[0].text;
     const sha1 = Release.elements[1].elements[0].text;
     out.releases[id] = { sha1, from: [], to: [] };
   });
 
+  //<ReleaseUpdatePaths><ReleaseUpdatePath><From>287</From><To>288</To><ExtraDataItem>...</ExtraDataItem></ReleaseUpdatePath></ReleaseUpdatePaths
   const ReleaseUpdatePaths = PatchManifest.elements[8];
   ReleaseUpdatePaths.elements.forEach((ReleaseUpdatePath: any) => {
     const from = ReleaseUpdatePath.elements[0].elements[0].text;
     const to = ReleaseUpdatePath.elements[1].elements[0].text;
+    //Release -1 does not exist but is a valid "from", e.g. for -1to0
     if (from !== '-1') {
-      out.releases[from].to.push(to);
+      out.releases[from].to.push(Number(to));
     }
-    out.releases[to].from.push(from);
+    out.releases[to].from.push(Number(from));
   });
 
   return out;