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-rw-r--r--games/mame/README5
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diff --git a/games/mame/README b/games/mame/README
index 75c9eafa8e..bc136a5b64 100644
--- a/games/mame/README
+++ b/games/mame/README
@@ -13,3 +13,8 @@ separate MESS build or binary.
This build requires around 2GB of storage in /tmp (or whatever you set
TMP to in the environment).
+
+Optionally, MAME can be built with a debugger for emulated ROM
+code. You don't need this just to play the games; it's mainly useful
+for developing MAME itself. To build the debugger, first install qt5,
+then set QTDEBUG=yes in the environment before building mame.