diff --git a/Koha/Middleware/UserEnv.pm b/Koha/Middleware/UserEnv.pm
index 03d515fdcf..ab67fab913 100644
--- a/Koha/Middleware/UserEnv.pm
+++ b/Koha/Middleware/UserEnv.pm
@@ -5,8 +5,20 @@ use parent qw(Plack::Middleware);
 
 use C4::Context;
 
+=head1 NAME
+
+Koha::Middleware::UserEnv - Middleware to ensure fresh userenv in all requests
+
+=head1 METHODS
+
+=head2 call
+
+This method is called for each request, and will unset the userenv to avoid contamination between requests.
+
+=cut
+
 sub call {
-    my ( $self, $env ) =@_;
+    my ( $self, $env ) = @_;
 
     my $req = Plack::Request->new($env);