diff --git a/notes/docs/bibliography.bib b/notes/docs/bibliography.bib
index af6bf5e..80f9df4 100644
--- a/notes/docs/bibliography.bib
+++ b/notes/docs/bibliography.bib
@@ -43,7 +43,7 @@
 }
 
 @misc{GSL,
-  title={Gnu Scientific Library Reference Manual (3rd Edition)},
+  title={GNU Scientific Library Reference Manual (3rd Edition)},
   author={M. Galassi et al},
   ISBN={0954612078},
   url={http://www.gnu.org/software/gsl/}