diff --git a/README b/README
index fd1ceb9..0a46d21 100644
--- a/README
+++ b/README
@@ -20,6 +20,7 @@ Prerequisites:
 - bison
 - fig2dev
 - ImageMagick
+- Netpbm
 - Gtk+ 2.x development package (libgtk2.0-dev or similar)
 - Liberation Fonts (ttf-liberation or similar)