diff --git a/README.md b/README.md
index 3d9ad4c..edbcfce 100644
--- a/README.md
+++ b/README.md
@@ -4,14 +4,30 @@ NeoGF is a library of tools for Gotcha Force.
 Pour plus d'info sur le jeu, rendez vous sur le [Wiki](http://re.wiki.virtualworld.fr/index.php/Gotcha_Force).
 
 ## pzztool.py
-Python3 script for unpack/repack and uncompress/compress of PZZ archive.
+Python3 script for unpack/repack unpzz/pzz and uncompress/compress of PZZ archive.
 
 ### User manual
-Unpack **source.pzz** in the default new folder _source_. If optional_dest_folder is specified we unpack in _optional_dest_folder_.
+unpzz **source.pzz** in the default new folder _source_. If optional_dest_folder is specified we unpack in _optional_dest_folder_. unpzz handle auto-decompress of all files extracted.
+```
+pzztool.py -unpzz source.pzz optional_dest_folder
+```
+pzz **source_folder** in the default new pzz file _source_folder.pzz_. If optional_dest.pzz is specified we pzz in _optional_dest.pzz_. pzz handle auto-compress / auto-decompress of all files extracted from the pzz according to their initial states in the pzz.
+```
+pzztool.py -pzz source_folder optional_dest.pzz
+```
+unpzz every pzz files present in _source_folder_ using the same directory. For each pzz a folder is created using the name of the pzz. If optional_dest_folder is specified we unpzz all files in _optional_dest_folder_ instead of source_folder. The batch pzz command could be very time consuming (1h30 for whole pzz in afs_data).
+```
+pzztool.py -bunpzz source_folder optional_dest_folder
+```
+pzz every folder present in _source_folder_ using the same directory. For each folder a pzz file is created using the name of the pzz. If optional_dest_folder is specified we pzz all folders in _optional_dest_folder_ instead of source_folder. The batch pzz command could be very time consuming (1h30 for whole pzz in afs_data).
+```
+pzztool.py -bpzz source_folder optional_dest_folder
+```
+Unpack **source.pzz** in the default new folder _source_. If optional_dest_folder is specified we unpack in _optional_dest_folder_. This is faster than unpzz but compression must be handled by user after the unpack.
 ```
 pzztool.py -u source.pzz optional_dest_folder
 ```
-Pack **source_folder** in the default new pzz file _source_folder.pzz_. If optional_dest.pzz is specified we pack in _optional_dest.pzz_.
+Pack **source_folder** in the default new pzz file _source_folder.pzz_. If optional_dest.pzz is specified we pack in _optional_dest.pzz_. This is faster than pzz but compression must be handled by user before the pack.
 ```
 pzztool.py -p source_folder optional_dest.pzz
 ```