diff --git a/src/kibit/rules/equality.clj b/src/kibit/rules/equality.clj
index 733401d..a672df6 100644
--- a/src/kibit/rules/equality.clj
+++ b/src/kibit/rules/equality.clj
@@ -19,5 +19,9 @@
 
   [(= ?x ?x)  true]
   [(== ?x ?x) true]
-  [(zero? 0)  true])
+  [(zero? 0)  true]
+    
+  ; nil?
+  [(= ?x nil) (nil? ?x)]
+  [(= nil ?x) (nil? ?x)])
 
diff --git a/test/kibit/test/equality.clj b/test/kibit/test/equality.clj
index bfb17a8..d7d6741 100644
--- a/test/kibit/test/equality.clj
+++ b/test/kibit/test/equality.clj
@@ -14,6 +14,8 @@
     '(pos? x) '(> x 0)
     '(pos? x) '(<= 1 x)
     '(neg? x) '(< x 0)
+    '(nil? x) '(= nil x)
+    '(nil? x) '(= x nil)
     true '(= x x)
     true '(== x x)
     true '(zero? 0)))