gnu: commencement: Add commentary regarding grafts.

* gnu/packages/commencement.scm: Add comments that were originally
  included only in the Git commit message of
  f00b85ff8d34df0a1879e593d4a85629b8586af7.

Co-Authored-By: Ludovic Courtès <ludo@gnu.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/gnu/packages/commencement.scm b/gnu/packages/commencement.scm
index 7286e954c5..c38f40f618 100644
--- a/gnu/packages/commencement.scm
+++ b/gnu/packages/commencement.scm
@@ -66,6 +66,15 @@
 ;;; To avoid circular dependencies, this module should not be imported
 ;;; directly from anywhere.
 ;;;
+;;; Below, we frequently use "inherit" to create modified packages.  The
+;;; reason why we use "inherit" instead of "package/inherit" is because we do
+;;; not want these commencement packages to inherit grafts.  By definition,
+;;; these packages are not depended on at run time by any of the packages we
+;;; use.  Thus it does not make sense to inherit grafts.  Furthermore, those
+;;; grafts would often lead to extra overhead for users who would end up
+;;; downloading those "-boot0" packages just to build package replacements
+;;; that are in fact not going to be used.
+;;;
 ;;; Code:
 
 (define gnu-make-boot0