diff --git a/src/lib.rs b/src/lib.rs
index 58dc99d..d3a5ba4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,6 +2,11 @@
 This crate is a port of
 [Haskell's QuickCheck](https://hackage.haskell.org/package/QuickCheck).
 
+QuickCheck is a library for random testing of program properties. The
+programmer provides a specification of the program, in the form of properties
+which functions should satisfy, and QuickCheck then tests that the properties
+hold in a large number of randomly generated cases.
+
 For detailed examples, please see the
 [README](https://github.com/BurntSushi/quickcheck).