diff --git a/src/attributes.mjs b/src/attributes.mjs
index 20a3d04b..36c5c4e1 100644
--- a/src/attributes.mjs
+++ b/src/attributes.mjs
@@ -46,7 +46,7 @@ export const uuid_attribute = {
 /**
  * @type {AttributeDefinition}
  */
-export const empty_attiribute = { ...default_attribute, type: "boolean" };
+export const empty_attribute = { ...default_attribute, type: "boolean" };
 
 /**
  * @type {AttributeDefinition}
diff --git a/src/pull-request.mjs b/src/pull-request.mjs
index 81d9a5ac..1b5ec3b8 100644
--- a/src/pull-request.mjs
+++ b/src/pull-request.mjs
@@ -9,7 +9,7 @@ import {
   body_attribute,
   title_attribute,
   boolean_attribute,
-  empty_attiribute
+  empty_attribute
 } from "./attributes.mjs";
 
 /**
@@ -130,10 +130,12 @@ export class PullRequest extends OwnedObject {
        */
       draft: boolean_attribute,
       dry: boolean_attribute,
-      empty: empty_attiribute
+      empty: empty_attribute
     };
   }
 
+  /** @type {Branch} */ source;
+
   constructor(source, owner, name, options) {
     let state = "OPEN";