1 files changed, 4 insertions, 0 deletions

diff --git a/README b/README
index 8ae1968..e122ca1 100644
--- a/README
+++ b/README
@@ -12,3 +12,7 @@ selected color channels.
 pnmcurve is intended to be used with the flimp 
 (http:www.ecademix.com/JohannesHofmann/flimp.html), but can also be 
 used as a standalone filter.
+
+Requirements
+============
+- GSL - GNU Scientific Library (http://www.gnu.org/software/gsl/)