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-rw-r--r--doc/manual/build-farm.xml5
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/manual/build-farm.xml b/doc/manual/build-farm.xml
index 4745d205c515..c86e19cdf3b9 100644
--- a/doc/manual/build-farm.xml
+++ b/doc/manual/build-farm.xml
@@ -65,7 +65,10 @@ will call whenever it wants to build a derivation.  The build hook
 will perform it in the usual way if possible, or it can accept it, in
 which case it is responsible for somehow getting the inputs of the
 build to another machine, doing the build there, and getting the
-results back.</para>
+results back.  The details of the build hook protocol are described in
+the documentation of the <link
+linkend="envar-build-hook"><envar>NIX_BUILD_HOOK</envar>
+variable</link>.</para>
 
 <example id='ex-remote-systems'><title>Remote machine configuration:
 <filename>remote-systems.conf</filename></title>