diff --git a/src/main/java/com/asana/models/Task.java b/src/main/java/com/asana/models/Task.java
index 0e487e4..fa1aeae 100644
--- a/src/main/java/com/asana/models/Task.java
+++ b/src/main/java/com/asana/models/Task.java
@@ -19,11 +19,17 @@ public static class Membership {
     @SerializedName("created_at")
     public DateTime createdAt;
 
+    @SerializedName("created_by")
+    public User createdBy;
+
     public boolean completed;
 
     @SerializedName("completed_at")
     public DateTime completedAt;
 
+    @SerializedName("completed_by")
+    public User completedBy;
+
     @SerializedName("custom_fields")
     public Collection<CustomField> customFields;
 
@@ -64,6 +70,9 @@ public static class Membership {
 
     public Task parent;
 
+    @SerializedName("permalink_url")
+    public String permalinkUrl;
+
     public Collection<Project> projects;
 
     @SerializedName("start_on")