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diff --git a/README.md b/README.md
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+++ b/README.md
@@ -1,4 +1,5 @@
 # lpunpack and lpmake
+To cross-compile you need `crossbuild-essential-arm64`/`crossbuild-essential-armel`/`crossbuild-essential-armhf` (sudo apt install $package).
 
 build:
 ./make.sh $ARCH