diff --git a/src/api/sys/lookupSelf.ts b/src/api/sys/lookupSelf.ts
index a2c7f5c..7891083 100644
--- a/src/api/sys/lookupSelf.ts
+++ b/src/api/sys/lookupSelf.ts
@@ -1,8 +1,5 @@
 import { appendAPIURL, getHeaders } from "../apiUtils";
-
-type TokenInfo = {
-  expire_time: string;
-}
+import { TokenInfo } from "../types/token";
 
 export async function lookupSelf(): Promise<TokenInfo> {
   const request = new Request(appendAPIURL("/v1/auth/token/lookup-self"), {
diff --git a/src/api/types/token.ts b/src/api/types/token.ts
new file mode 100644
index 0000000..2215496
--- /dev/null
+++ b/src/api/types/token.ts
@@ -0,0 +1,19 @@
+export type TokenInfo = {
+  accessor: string;
+  creation_time: number;
+  creation_ttl: number;
+  display_name: string;
+  entity_id: string;
+  expire_time: string;
+  explicit_max_ttl: 0;
+  id: string;
+  identity_policies: string[];
+  issue_time: string;
+  meta: any;
+  num_uses: number;
+  orphan: Boolean;
+  path: string;
+  policies: string[];
+  renewable: Boolean;
+  ttl: number;
+}
\ No newline at end of file
diff --git a/src/api/types/transit.ts b/src/api/types/transit.ts
index 015f130..074103c 100644
--- a/src/api/types/transit.ts
+++ b/src/api/types/transit.ts
@@ -11,6 +11,7 @@ export const enum TransitKeyTypes {
   RSA_4096 = "rsa-4096",
 }
 
+// Type when used to make new transit keys.
 export type TransitKeyBaseType = {
   name: string;
   convergent_encryption: Boolean;
@@ -20,10 +21,11 @@ export type TransitKeyBaseType = {
   type: keyof typeof TransitKeyTypes;
 }
 
+// Type returned when calling getTransitKey
 export type TransitKeyType = TransitKeyBaseType & {
-  keys?: {
+  keys: {
     [version: string]: number;
-  },
+  };
   min_decryption_version: number;
   min_encryption_version: number;
   supports_encryption: Boolean;