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diff --git a/README.md b/README.md
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+# DCIMTOOLS
+
+A collection of shell scripts to manage the JPEG images produced by digital cameras, phones and other devices.
+
+## Scripts
+
+### dcimrename
+ 
+
+```dcimrename file1.jpg file2.jpg ...```
+
+Will read the EXIF timestamp from the jpg files on the command line and alter the file's modification time accordingly. Renames to file using the format IMG_yyyyddmm_hhmmss.jpg.
+
+Note that the file extension has to be ```.jpg``` in lower case, other extensions are ignored. You can preprocess your files with the linux ```rename``` utility.
+
+For example, if your files have their extension in upper case:
+
+```rename .JPG .jpg *.JPG```
+
+Also note the file name format has a resolution of one second. If your pictures' timestamp differ by less then a second, files will be overwritten. In general, the script does not check if files already exist and mercilessly overwrites them.
+
+### dcimdirsort
+
+```dcimdirsort```
+
+Moves files into a subdirectory for each day, based on the file's modification time.
+
+For each file on the command line, it's file modification time will be read. If it doesn't exist already, a subdirectory with the format ```yyyy-mm-dd``` will be created and the file will be moved into it.
+
+### dcimtimestamp
+
+```dcimtimestamp file1.jpg file2.jpg ...```
+
+Writes the files modification time to the EXIF timestamp. Can be used to correct broken or missing picture timestamps. The same .jpg file extension rule applies.
+
+## Workflow
+
+#### Prepare
+Copy all the picture files you want to manage in a single directory. Make sure they have a valid and correct EXIF timestamp. Make sure you do not have any pictures taken less then a second apart.
+
+#### Rename
+Make sure all the pictures have the .jpg extension. If they don't, rename them accordingly.
+
+Run ```dcimrename *.jpg```
+
+#### Move to subdirectories
+
+Run ```dcimdirsort *.jpg```
+
+
+## Notes
+
+Obviously, there is room for improvement. Ideally I'd write a C program and roll all functionallity into one program. Add additional checks and customization options etc...
+
+## License
+
+dcimtools copyright (c) Stijn "Ingar" Buys, 2022 <ingar@telenet.be>
+
+dcimtools is available under the terms and conditions of the Do What The Fuck You Want To Public License
+
+#### DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+Version 2, December 2004 
+
+Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+
+Everyone is permitted to copy and distribute verbatim or modified copies of this license document, and changing it is allowed as long as the name is changed. 
+
+#### DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+
+##### TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 
+
+* You just DO WHAT THE FUCK YOU WANT TO.
+
diff --git a/dcimdirsort b/dcimdirsort
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+#!/bin/sh
+
+if [ -z "$1" ]; then
+	echo "Move files into a directory per day, based on file modification time"
+	echo "usage: $0 file1 file2 ..."
+	exit 0
+fi
+
+while [ ! -z "$1" ]; do
+	file="$1"
+
+	file_date=`date -r "${file}" +"%Y-%m-%d"`
+	
+	if [ ! -d "${file_date}" ]; then
+		mkdir "${file_date}"
+	fi
+
+	echo "Moving ${file} to ${file_date}/"
+
+	mv "${file}" "${file_date}/"
+
+	shift
+done
+
diff --git a/dcimrename b/dcimrename
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+#!/bin/sh
+
+if [ -z "$1" ]; then
+	echo "Rename file to IMG_yyyyddmm_hhmmss.jpg using the EXIF timestamp."
+	echo "usage: $0 file1.jpg file2.jpg ..."
+	exit 0
+fi
+
+while [ ! -z "$1" ]; do
+	file="$1"
+
+	if [ `basename "${file}" ".jpg"`".jpg" = "${file}" ]; then
+	
+		echo "renaming $file"
+
+		# set file timestamp from exif data
+		exiftool "-DateTimeOriginal>FileModifyDate" "${file}"
+
+		# get timestamp from file
+		#file_timestamp=`date -r "${file}" +"IMG_%Y%m%d_%H%M%S%2N"`
+		
+		file_timestamp=`date -r "${file}" +"IMG_%Y%m%d_%H%M%S"`
+		mv "${file}" "${file_timestamp}.jpg"
+	fi
+
+	shift
+done
+
diff --git a/dcimtimestamp b/dcimtimestamp
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+#!/bin/sh
+
+if [ -z "$1" ]; then
+	echo "Set file modification time to EXIF timestamp"
+	echo "usage: $0 file1.jpg file2.jpg ..."
+	exit 0
+fi
+
+while [ ! -z "$1" ]; do
+	file="$1"
+
+	if [ `basename "${file}" ".jpg"`".jpg" = "${file}" ]; then
+
+		echo "settimg modification time for $file"
+
+                # set file timestamp from exif data
+                exiftool "-DateTimeOriginal>FileModifyDate" "${file}"
+	fi
+
+	shift
+done
+