diff --git a/doc/README b/doc/README
index 01b1d4005..f45bf0c15 100644
--- a/doc/README
+++ b/doc/README
@@ -18,6 +18,9 @@ with each other, with the help of a P2P network to check for double-spending.
 
 Setup
 -----
+You need the Qt4 run-time libraries to run bitcoin-qt. On Debian or Ubuntu:
+  sudo apt-get install libqtgui4
+
 Unpack the files into a directory and run:
  bin/32/bitcoin-qt (GUI, 32-bit)
  bin/32/bitcoind (headless, 32-bit)