diff --git a/README b/README
index bdb4b86..dff27bd 100644
--- a/README
+++ b/README
@@ -4,7 +4,7 @@ Language-Fortran
 
 For Debian/Ubuntu:
 
-   sudo apt-get install ghc alex happy libghc-haskell-src-dev
+   sudo apt-get install ghc alex happy libghc-haskell-src-dev libghc-parsec3-dev
 
 1. Installing
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