diff --git a/2_78.rkt b/generics.rkt
similarity index 99%
rename from 2_78.rkt
rename to generics.rkt
index 3558292..29379cb 100644
--- a/2_78.rkt
+++ b/generics.rkt
@@ -1,6 +1,7 @@
 #lang sicp
 (#%require racket/trace)
 
+;; This file covers exercises 2.78 to 2.97.
 
 ;;;from section 1.2.5, for Section 2.1.1
 (define (gcd a b)