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diff --git a/apps/plugins/puzzles/src/unfinished/README b/apps/plugins/puzzles/src/unfinished/README
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+This subdirectory contains puzzle implementations which are
+half-written, fundamentally flawed, or in other ways unready to be
+shipped as part of the polished Puzzles collection.
+
+The CMake build system will _build_ all of the source in this
+directory (to ensure it hasn't become unbuildable), but they won't be
+included in all-in-one puzzle binaries or installed by 'make install'
+targets. If you want to temporarily change that, you can reconfigure
+your build by defining the CMake variable PUZZLES_ENABLE_UNFINISHED.
+For example,
+
+  cmake . -DPUZZLES_ENABLE_UNFINISHED="group;slide"
+
+will build as if both Group and Slide were fully official puzzles.