diff --git a/manifest.toml b/manifest.toml
index d3f4df4..fb36ef6 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -106,5 +106,15 @@ ram.runtime = "200M"
     main.default = 8083
     
     [resources.apt]
-    packages = [ "sqlite3", "imagemagick", "libldap2-dev", "libsasl2-dev", "python3-venv", "python3-dev", "python3-lxml", "libjpeg-dev", "zlib1g-dev", "libffi-dev" ]
-    
+    #sqlite3      is required to tweak the database in the scripts
+    #imagemagick  is required for cover extraction from EPUBs
+    #python3-venv is required for installing a venv environnement in the scripts
+    #python3-dev  is required for compiling the ldap dependency during pip install
+    #libldap2-dev is required for compiling the ldap dependency during pip install
+    #libsasl2-dev is required for compiling the ldap dependency during pip install
+    #libjpeg-dev  is required for comics and image reading in browser
+    packages = [ "sqlite3", "imagemagick",  "python3-venv", "python3-dev", "libldap2-dev", "libsasl2-dev", "libjpeg-dev" ] 
+    #for reference, dependencies that have been removed in 0.96.21~ynh1:
+    #python3-lxml : not required in packages as already part of yunohost dependencies
+    #zlib1g-dev   : is part of python3-dev dependencies : not required anymore
+    #libffi-dev   : usage unknown
\ No newline at end of file