diff --git a/REQUIREMENTS b/REQUIREMENTS
index 4af1a43b99..a3e6134652 100644
--- a/REQUIREMENTS
+++ b/REQUIREMENTS
@@ -19,6 +19,7 @@ Optional libraries:
 gdk_pixbuf
 libgnomeui	(for gstplay, gsteditor, autoplug example, several tests)
 libglade	(for gstplay, gsteditor)
+libHermes	(for gstplay)
 
 libghttp	(for httpsrc)
 libXv		(for videosink)