diff --git a/README.md b/README.md
index 309fbea..9c74a8b 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ Logar is a simple log archive tool to manage HTTP log files.
 
 ## LICENSE
 
-Logar is released under the GNU AGPL+ license. Enjoy!
+Logar is released under the GNU AGPLv3+ license. Enjoy!
 
 Authors:
 * Christian Pierre MOMON <christian@momon.org>
@@ -26,23 +26,75 @@ License of other stuff:
 
 
 ## DOCUMENTATION
-
 <pre>
-cpm@ocmstar (10:37:16) ~/Projets/Logar/Dev/logar/dist/logar-0.1.1-SNAPSHOT_20210227051001 95 > ./logar.sh 
-Java requirement............... OK
-2021-02-27T10:37:21.377098 Logar call: 
-No parameter.
-Logar CLI version 0.1.1-20210227051001
+cpm@ocmstar (13:19:32) ~/Projets/Logar/Dev/logar/dist/logar-0.1.1-SNAPSHOT_20210425131921 40 > ./logar.sh -h
+2021-04-25T13:19:34.176928 Logar call: -h
+Logar CLI version 0.1.1-20210425131921
 Usage:
     logar [ -h | -help | --help ]
-    logar -version
-    logar archive source target
-    logar test source
-    logar anonymize source target
+    logar [ -v | -version | --version ]
+    logar anonymize      fileordirectory [mapfile]    anonymize ip and user
+    logar archive [-dry] source target                archive previous month from /var/log/nginx/ tree
+    logar check          fileordirectory              check line format in log file
+    logar checksort      fileordirectory              check sort in log file
+    logar sort           fileordirectory              sort log files by datetime
+    logar testconcate    fileordirectory              test line concate in log file
 
 Done.
 </pre>
 
+### Command anonymize
+
+This command is useful to anonymize log. It can anonymized accces log file and Nginx error log file from default Nginx combined format. The result is a new file whose name contains "-anon".
+
+Optionally a map file can be set as parameter. Then the file is load and used to run. At the end, the file will be erased by a new one.
+
+The anonymization does not change the line length:
+- ip address: replaced with a valid random generate ip with the same length
+- remote user: replaced with a random [a..z] string with the same length
+
+Examples:
+- logar anonymize test.log
+- logar anonymize test.log.gz table
+
+### Command archive
+
+This command archive previous month log lines from a /var/log/nginx/ directory to single file by domain.
+
+The optionally *-dry* parameter is useful to test the archive process without produced any target file.
+
+Example:
+- logar /var/log/nginx/ target/
+- logar -dry /var/log/nginx/ target/
+
+### Command check
+
+This command check bad format line in log files (access or error). It is useful to detect malformed log file or test the logar parsing feature.
+
+Example: 
+- logar check /var/log/nginx/date.chapril.org/
+
+### Command checksort
+
+This command check if log lines are sorted by datetime. It is useful to detect unsorted log file. Reminder: sorted file are mandatory to Webalizer.
+
+Example: 
+- logar checksort /var/log/nginx/date.chapril.org/
+- logar checksort /var/log/nginx/date.chapril.org/date.chapril.org-access-2021-01.log.gz
+
+### Command sort
+
+This command sorts log files. A backup file is produced. A check is made between original file and produced file.
+
+Caution: as the log file is fully load in memory, huge file are potentially difficult.
+
+Example: 
+- logar checksort /var/log/nginx/date.chapril.org/
+- logar checksort /var/log/nginx/date.chapril.org/date.chapril.org-access-2021-01.log.gz
+
+### Command testconcate
+
+This command tests a advanced feature of rebuild log line. Perhaps useful feature in future.
 
 ## Requirements