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+++ b/hurd/porting/guidelines.mdwn
@@ -36,7 +36,9 @@ built will generate code for.
When using GNU autotools to configure a package config.guess and config.sub from autotools-dev
are used to find out the build machine identity: CPU_TYPE-MANUFACTURER-OPERATING_SYSTEM.
For GNU/Hurd config.guess gives 'i686-unknown-gnu0.3'. Sometimes a quadruple is used
-adding KERNEL, e.g. for Linux on an amd64: 'x86_64-unknown-linux-gnu'. config.sub is used to
+adding KERNEL, e.g. for Linux on an amd64: 'x86_64-unknown-linux-gnu'. This
+is however actually a triple, it just happens that the operating system part
+unfortunately contains a '-'. config.sub is used to
canonicalize on these triplets, e.g. config.sub i686-gnu gives 'i686-pc-gnu'.
On Debian systems the build Makefile is debian/rules and some Debian packages will set $host to