diff --git a/README.md b/README.md
index 93517a9..4474c1e 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,7 @@ Special thanks to Arthur Titeica for the [AUR Package](https://aur.archlinux.org
 * CMake 
 * compilers support C++11
 * libpoppler with xpdf header >= 0.20.2 (compile with --enable-xpdf-headers)
+ * Install libpng (and headers) BEFORE you compile libpoppler if you want background images generated
 * boost c++ library (program options, gil, filesystem, system(which is actually required by filesystem))
 * fontforge (with header files)