doc: Explain where the number of build users comes from.

Suggested by Thomas Schwinge <thomas@codesourcery.com>.

* doc/guix.texi (Build Environment Setup): Explain where the number of build
  users comes from.

1 files changed, 3 insertions, 0 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index c1027466363..bcfa52d5b11 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -478,6 +478,9 @@ Bash syntax and the @code{shadow} commands):
 @end example
 
 @noindent
+The number of build users determines how many build jobs may run in
+parallel, as specified by the @option{--max-jobs} option
+(@pxref{Invoking guix-daemon, @option{--max-jobs}}).
 The @code{guix-daemon} program may then be run as @code{root} with:
 
 @example