mk/git-package.mk: improve documentation

[Roland Illig <rillig%NetBSD.org@localhost>]

Module Name:	pkgsrc-wip
Committed By:	Roland Illig <rillig%NetBSD.org@localhost>
Pushed By:	rillig
Date:		Sun Feb 25 19:35:15 2018 +0000
Changeset:	a70f5530b57f73cdd2fe4a2fa3917711b0f26c81

Modified Files:
	mk/git-package.mk

Log Message:
mk/git-package.mk: improve documentation

To see a diff of this commit:
https://wip.pkgsrc.org/cgi-bin/gitweb.cgi?p=pkgsrc-wip.git;a=commitdiff;h=a70f5530b57f73cdd2fe4a2fa3917711b0f26c81

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

diffstat:
 mk/git-package.mk | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diffs:
diff --git a/mk/git-package.mk b/mk/git-package.mk
index 2a90439d05..3e0b7c004c 100644
--- a/mk/git-package.mk
+++ b/mk/git-package.mk
@@ -8,6 +8,9 @@
 # GIT_REPO
 #	The URL of the Git repository.
 #
+#	If the package needs more than one repository, see GIT_REPOSITORIES
+#	below.
+#
 #	Examples:
 #		https://github.com/NetBSD/pkgsrc
 #		git://git%github.com@localhost:NetBSD/pkgsrc.git
@@ -61,6 +64,15 @@
 #		GIT_REPO.second=	git://git%github.com@localhost:NetBSD/pkgsrc.git
 #		GIT_BRANCH.second=	master
 #
+# Variables set by this file:
+#
+# DISTFILES
+#	Defaults to an empty list, which means that MASTER_SITES does not
+#	need to be defined.
+#
+# PKGREVISION
+#	Defaults to the current date in the format yyyymmdd, e.g. 20180225.
+#
 # Keywords: git github
 
 .if !defined(_PKG_MK_GIT_PACKAGE_MK)