diff --git a/authzgroups.php b/authzgroups.php
index d5460ba..3a2c574 100644
--- a/authzgroups.php
+++ b/authzgroups.php
@@ -120,7 +120,7 @@ class authzgroups
     return $ressource[$object];
   }
 
-  /** Return TRUE if the user right allow to see the object 
+  /** Return TRUE if the user right allow to see the object (RO or RW) 
       Return a 403 Exception if the user don't have the right
       Return a 401 Exception if the user is not connected */
   public function accessRight ($module, $user, $object)
@@ -137,6 +137,7 @@ class authzgroups
     if ($object === null || ! is_string ($object))
       throw new Exception ("Object not provided to authzgroups\\accessRight",
                            500);
+    if ($object === "/") $object = "";
     $rc = $this->allow ($module, $user, "/$object");
     trigger_error ("authzgroups : accessRight ('$module','$user','/$object')".
                    "=$rc", E_USER_NOTICE);
@@ -147,7 +148,7 @@ class authzgroups
     throw new Exception (_("Access forbidden"), 403);
   }
 
-  /** Return TRUE if the user right allow to edit the object 
+  /** Return TRUE if the user right allow to edit the object (RW only)
       Return a 403 Exception if the user don't have the right
       Return a 401 Exception if the user is not connected */
   public function accessWrite ($module, $user, $object)
@@ -164,6 +165,7 @@ class authzgroups
     if ($object === null || ! is_string ($object))
       throw new Exception ("Object not provided to authzgroups\\accessWrite",
                            500);
+    if ($object === "/") $object = "";
     $rc = $this->allow ($module, $user, "/$object");
     trigger_error ("authzgroups : accessWrite ('$module','$user','/$object')".
                    "=$rc", E_USER_NOTICE);
@@ -175,7 +177,7 @@ class authzgroups
   }
 
   /** Return TRUE if the user right allow to see but without modification
-      the object 
+      the object  (RO only)
       Return a 403 Exception if the user don't have the right
       Return a 401 Exception if the user is not connected */
   public function accessReadOnly ($module, $user, $object)
@@ -192,6 +194,7 @@ class authzgroups
     if ($object === null || ! is_string ($object))
       throw new Exception ("Object not provided to authzgroups\\accessReadOnly",
                            500);
+    if ($object === "/") $object = "";
     $rc = $this->allow ($module, $user, "/$object");
     trigger_error ("authzgroups : accessReadOnly ('$module','$user','/$object')"
                    ."=$rc", E_USER_NOTICE);