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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -21,6 +21,11 @@ Not yet complete. The current `make distribute` will make a deb and rpm, but is
 missing desktop files and potentially more desktop friendly distributions like
 flatpak.
 
+### Flatpak
+
+Since flatpak expects offline building, we use `flatpak-cargo-generator` to
+generate the sources.
+
 ## The wmap language
 
 Learn more about the language at [map.tranquil.systems][map].