diff --git a/README b/README
index ead997d..ac777c5 100644
--- a/README
+++ b/README
@@ -8,6 +8,9 @@ Requirements
 gtk2 (>= 2.18.6)
 girara
 
+Please note that you need to have a working pkg-config installation
+and that the Makefile is only compatible with GNU make.
+
 Installation
 ------------
 To build and install zathura: