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-rw-r--r--doc/contributing.texi4
1 files changed, 2 insertions, 2 deletions
diff --git a/doc/contributing.texi b/doc/contributing.texi
index 5331d3e18a..6770fae222 100644
--- a/doc/contributing.texi
+++ b/doc/contributing.texi
@@ -57,14 +57,14 @@ all the dependencies and appropriate environment variables are set up to
 hack on Guix:
 
 @example
-guix environment guix
+guix environment guix --pure
 @end example
 
 @xref{Invoking guix environment}, for more information on that command.
 Extra dependencies can be added with @option{--ad-hoc}:
 
 @example
-guix environment guix --ad-hoc help2man git strace
+guix environment guix --pure --ad-hoc help2man git strace
 @end example
 
 Run @command{./bootstrap} to generate the build system infrastructure