README: add setgid utmp instructions

diff --git a/README b/README
index 783e59abc0684f2d84886e03d7bfba1e0c04254d..4027cd9ef0a4000374c11fbc361d63850e06f66e 100644 (file)
--- a/README
+++ b/README
@@ -31,6 +31,11 @@ INSTALLATION
 
     ./configure && make && make check
 
+The libutempter is not available, the binary must be setgid utmp:
+
+    chgrp utmp src/wall-notify
+    chmod g+s src/wall-notify
+
 
 USAGE
 -----