diff --git a/github.lisp b/github.lisp
index aa96cd6..d17bd63 100644
--- a/github.lisp
+++ b/github.lisp
@@ -155,7 +155,7 @@ slots."))
   ((languages :reader languages))
   (:documentation "List of languages."))
 
-(defclass parents ()
+(defclass parent ()
   (id)
   ;; Yes this is a little strange... but this is how github does it, it
   ;; can be cleaned up later.
@@ -175,7 +175,7 @@ slots."))
          authored-date message tree committer)
   (:documentation "Detailed information on a commit."))
 
-(defclass modified ()
+(defclass file-diff ()
   (diff filename)
   (:documentation "Modification information for a commit."))
 
@@ -653,4 +653,15 @@ original TITLE and BODY."))
                                                   ,repository ,issue)
                            :comment comment)))
 
+(defpackage #:nisp.github-extra
+  (:use :cl :iterate :nisp.github)
+  (:export #:show-followers-not-followed))
+(in-package :nisp.github-extra)
+;;; Extra
+(defun show-followers-not-followed (username)
+  "Show followers that USERNAME is not following."
+  ;; Thanks to scott olson for the idea.
+  (set-difference (show-followers username) (show-following username)
+                  :test #'equal))
+
 ;;; End file
diff --git a/json.lisp b/json.lisp
index 4e176a1..6f9af96 100644
--- a/json.lisp
+++ b/json.lisp
@@ -11,8 +11,8 @@ ALIST. Hash table is initialized using the HASH-TABLE-INITARGS."
 
 (defparameter +github-class-map+
   (alist-hash-table '(("USER" . "USER") ("PLAN" . "PLAN") ("AUTHOR" . "SIMPLE-USER")
-                      ("PARENTS" . "PARENTS") ("COMMIT" . "COMMIT")
-                      ("MODIFIED" . "MODIFIED") ("COMMITTER" . "SIMPLE-USER")
+                      ("PARENTS" . "PARENT") ("COMMIT" . "COMMIT")
+                      ("MODIFIED" . "FILE-DIFF") ("COMMITTER" . "SIMPLE-USER")
                       ("DELETE-TOKEN" . "DELETE-TOKEN") ("TREE" . "TREE")
                       ("BLOB" . "BLOB") ("BLOCKS" . "BLOCKS")
                       ("HEADS" . "HEADS") ("COMMITS" . "COMMITS")
diff --git a/users.lisp b/users.lisp
index f58ee80..0bd5237 100644
--- a/users.lisp
+++ b/users.lisp
@@ -5,7 +5,4 @@
   (:documentation "Person information."))
 
 (defclass simple-user (contact-data) ()
-  (:documentation "About the simplest user information github will send."))
-
-(defclass committer (simple-user) ())
-(defclass author (simple-user) ())
\ No newline at end of file
+  (:documentation "About the simplest user information github will send."))
\ No newline at end of file