diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..b6fff00
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,90 @@
+// https://github.com/indutny/ocsp
+declare module "ocsp" {
+    import * as Http from "http";
+    import * as Https from "https";
+
+    // https://github.com/indutny/ocsp#agent
+    class Agent extends Https.Agent {
+        constructor(opts?: AgentOptions);
+    }
+
+    interface AgentOptions extends Https.AgentOptions {
+        CACacheSize?: number
+    }
+
+    // https://github.com/indutny/ocsp#cache
+    class Cache {
+        constructor(options?: { probe?: () => any, store?: () => any, filter?: (url: string, callback: () => any) => any });
+
+        request(id: string | Buffer, options: { url: string, ocsp: Buffer }, cb: (err: Error | null, resp: Buffer) => any): void
+
+        probe(id: string, cb: (error: Error, cached: { response: any, timer: NodeJS.Timeout } | false) => any): void
+    }
+
+
+    // https://github.com/indutny/ocsp#server
+    let Server: IServer;
+
+    interface IServer {
+
+        create(param: {
+            cert: string | Buffer,
+            key: string | Buffer
+        }): ExtServer
+    }
+
+
+    interface ExtServer extends Http.Server {
+        addCert(serialNumber: number, status: "good" | "revoked", info?: {
+            revocationTime?: Date,
+            revocationReason?: "unspecified"
+                | "keyCompromise"
+                | "CACompromise"
+                | "affiliationChanged"
+                | "superseded"
+                | "cessationOfOperation"
+                | "certificateHold"
+                | "removeFromCRL"
+                | "privelegeWithdrawn"
+                | "AACompromise"
+        }): void
+    }
+
+
+    // https://github.com/indutny/ocsp#check
+    function check(options: {
+        cert: string | Buffer,
+        issuer: string | Buffer
+    }, cb: (err: Error, res: Http.ServerResponse) => any): void
+
+
+    // https://github.com/indutny/ocsp#verify
+    function verify(options: {
+        request: Http.IncomingMessage,
+        response: Http.ServerResponse,
+        issuer?: string | Buffer
+    }, cb: (err: Error, res: Http.ServerResponse) => any): void
+
+
+    // https://github.com/indutny/ocsp#requestgenerate
+    let request: IRequest;
+
+    interface IRequest {
+        generate(
+            cert: string | Buffer,
+            issuerCert: string | Buffer): Req
+    }
+
+    interface Req extends Http.IncomingMessage {
+        id: Buffer,
+        certID: any,
+        data: any,
+        cert: Buffer,
+        issuer: Buffer
+    }
+
+    // https://github.com/indutny/ocsp#getocspuri
+    function getOCSPURI(
+        cert: string | Buffer,
+        cb: (err: Error | null, uri?: string | null) => any): void
+}
diff --git a/package.json b/package.json
index e05b07f..d0a5d5d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,7 @@
 {
   "name": "ocsp",
   "version": "1.2.0",
+  "types": "index.d.ts",
   "description": "OCSP Stapling implementation",
   "main": "lib/ocsp.js",
   "scripts": {