From 8f14822fe401d4cdbdbce52aeeb8ad849350c493 Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Tue, 28 Feb 2017 00:29:16 +0530
Subject: Improve commentary.

* el-exiftool.el: Comment on the ExifTool -stay_open process.
---
 el-exiftool.el | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/el-exiftool.el b/el-exiftool.el
index 284064f..3bc6768 100644
--- a/el-exiftool.el
+++ b/el-exiftool.el
@@ -27,6 +27,12 @@
 ;; el-exiftool is an elisp wrapper around ExifTool.  ExifTool supports
 ;; reading and writing metadata in various formats including EXIF, XMP
 ;; and IPTC.
+;;
+;; There is a significant overhead in loading ExifTool for every
+;; command to be exected. So, el-exiftool starts an ExifTool process
+;; in the -stay_open mode, and passes all commands to it. For more
+;; about ExifTool's -stay_open mode, see
+;; http://www.sno.phy.queensu.ca/~phil/exiftool/#performance
 
 ;;; Code:
 
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