[nongnu] elpa/systemd e7a2efb 021/131: mention `package-install-file` in README

[ELPA Syncer]

branch: elpa/systemd
commit e7a2efbac3913dcfde4a7844cbd75ba7d5154e47
Author: Mark Oteiza <mvoteiza@udel.edu>
Commit: Mark Oteiza <mvoteiza@udel.edu>

    mention `package-install-file` in README
---
 README | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/README b/README
index 4f6fccc..de3f066 100644
--- a/README
+++ b/README
@@ -6,7 +6,12 @@ Major mode for editing systemd units in GNU Emacs.
 Installation
 ------------
 
-To install, do
+In Emacs 25 or later, one can locally install as a package with
+
+  M-x package-install-file RET /path/to/systemd-mode RET
+
+Otherwise, for either installing into one's `load-path` or a system
+install, do the usual
 
   make
   make install