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diff --git a/games/ufoai/README b/games/ufoai/README
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@@ -6,4 +6,13 @@ game captures the spirit of the UFO: Enemy Unknown, the first one in
the X-COM series. It tries to combine military realism with science
fiction with the weirdness of an alien invasion. The game, however,
is not a remake or a sequel.
+
It runs on a modified Quake 2 game engine.
+
+If you want to try out the game editor (uforadiant), install gtksourceview
+before running this build.
+
+If you're going to install the package on a host whose CPU lacks streaming
+SIMD extensions, set SSE=no in the script's environment. To find out
+whether SSE is supported, try "grep sse /proc/cpuinfo". If you get no
+output, you don't have SSE.