diff --git a/README.md b/README.md
index 545be29..82fac1b 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,11 @@ Screenshot-capturing utility for X11.
 Requirements
 ------------
 
-You must have xcb installed.
+You must have:
+
+- python3 (build-time)
+- libxcb
+- xcb-util-image
 
 Installation
 ------------