diff --git a/README.md b/README.md
index 16c9da7..ea862d4 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,7 @@ any modern installation of Haskell, such as
 
 First install Parsec.
 
-    cabal install parsec
+    cabal install --lib parsec
 
 Below we show how a very simple parser that tests matching parentheses
 was made from GHCI (the interactive GHC environment), which we started