diff --git a/README b/README
index 6e84135..b11fc08 100644
--- a/README
+++ b/README
@@ -6,6 +6,7 @@ dmenu is a generic and efficient menu for X.
 Requirements
 ------------
 In order to build dmenu you need the Xlib header files.
+Pasting the X selection to dmenu requires the sselp utility at runtime.
 
 
 Installation