diff --git a/lib/Nim/Plugin/Entry/File.pm b/lib/Nim/Plugin/Entry/File.pm
index 521d2a3..a8fb73f 100644
--- a/lib/Nim/Plugin/Entry/File.pm
+++ b/lib/Nim/Plugin/Entry/File.pm
@@ -3,6 +3,8 @@ use Any::Moose;

 with 'Nim::Plugin';

+has suffix => ( is => 'rw', isa => 'Str', default => 'txt' );
+
 use Carp;
 use Nim::Entry;

@@ -25,10 +27,10 @@ sub find {
     $context->conf->data_dir->recurse( callback => sub {
         my $f = $_[0];
         return unless -f $f;
-        return unless $f->basename =~ /\.txt$/;
+        return unless $f->basename =~ /\.$self->{suffix}$/;

         (my $path = $f->parent) =~ s/^$dir//;
-        (my $name = $f->basename) =~ s/\.txt$//;
+        (my $name = $f->basename) =~ s/\.$self->{suffix}$//;

         $context->log->info('find: %s', $f);