diff --git a/README.md b/README.md
index c5563eb..70fbe9b 100644
--- a/README.md
+++ b/README.md
@@ -12,12 +12,15 @@ See [Dockerfile](Dockerfile) for details.
 
 ### MSYS2 (ucrt64)
 
+Copy `doom1.wad` into the build or parent directories. In a `ucrt64` shell:
+
 ```bash
 pacman -S mingw-w64-ucrt-x86_64-SDL2 mingw-w64-ucrt-x86_64-toolchain
 cd doompanning
 mkdir build
 cmake -G"MinGW Makefiles" ..
 cmake --build . -j
+./doompanning.exe
 ```