diff --git a/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Simple.pm b/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Simple.pm
index fdaaa4225..e954178e2 100644
--- a/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Simple.pm
+++ b/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Simple.pm
@@ -766,22 +766,31 @@ sub buildHiddenForm {
 # @return nothing
 sub initCaptcha {
     my $self = shift;
+    
+    # Store captcha data
     opendir( OUTPUT, $self->{captcha_output} )
       or $self->lmLog( "Can't open captcha output dir", "error" );
     opendir( DATA, $self->{captcha_data} )
       or $self->lmLog( "Can't open captcha data dir", "error" );
+    
+    # Clean previous captcha datas
     foreach ( readdir(OUTPUT) ) {
         next if ( $_ eq ".." or $_ eq "." );
         system("rm -f $_ &>/dev/null")
           or $self->lmLog( "Can't clean captcha output dir!", "warn" );
     }
+
+    # Build Authen::Captcha object
     $self->{captcha} = Authen::Captcha->new(
         data_folder   => $self->{captcha_data},
         output_folder => $self->{captcha_output}
     );
+
+    # Generate a new captcha from captcha object
     $self->{captcha_code} =
       $self->{captcha}->generate_code( $self->{captcha_size} );
     $self->{captcha_img} = "/captcha_output/" . $self->{captcha_code} . ".png";
+
     closedir(DATA) and closedir(OUTPUT);
 }