diff --git a/lisp.md b/lisp.md
index a8f9074..cfbf524 100644
--- a/lisp.md
+++ b/lisp.md
@@ -55,8 +55,8 @@ argument, a list of string describing the types for the generic method.
 **cond**: checks conditions and evaluates the corresponding expression.
 ```
 (cond
-  (> 1 2) t
-  t f)
+  ((> 1 2) t)
+  (t f))
 ```
 
 **if**: a conditional. `(if t 1 2)`