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-rw-r--r--doc/contributing.texi2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/contributing.texi b/doc/contributing.texi
index 7417f28d14..c55eb63382 100644
--- a/doc/contributing.texi
+++ b/doc/contributing.texi
@@ -443,7 +443,7 @@ as timestamps or randomly-generated output in the build result.
Another option is to use @command{guix challenge} (@pxref{Invoking guix
challenge}). You may run it once the package has been committed and
-built by @code{hydra.gnu.org} to check whether it obtains the same
+built by @code{@value{SUBSTITUTE-SERVER}} to check whether it obtains the same
result as you did. Better yet: Find another machine that can build it
and run @command{guix publish}. Since the remote build machine is
likely different from yours, this can catch non-determinism issues