diff --git a/benches/bench.py b/benches/bench.py
deleted file mode 100644
index a046a408..00000000
--- a/benches/bench.py
+++ /dev/null
@@ -1,21 +0,0 @@
-#!/usr/bin/env python
-import subprocess;
-from time import time;
-from sys import exit;
-from os.path import isfile;
-
-results = [];
-
-filename = "bench.png"
-if not isfile(filename):
-    print("Invalid file");
-    exit(1);
-for opt_level in range(1, 7):
-    start_time = time();
-    command = subprocess.Popen(["oxipng", "-o", str(opt_level), "-q", "--stdout", filename], stdout=subprocess.PIPE);
-    size = len(command.communicate()[0]);
-    result_time = time()-start_time;
-    results.append({"program": "oxipng", "opt_level": opt_level, "time": result_time, "size": size});
-
-for result in results:
-    print("%s -o%s: \n Time: %ss \n Size: %s bytes" % (result["program"], result["opt_level"], result["time"], result["size"]));
diff --git a/src/lib.rs b/src/lib.rs
index 2464c44b..be68879d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -13,7 +13,7 @@ extern crate rayon;
 extern crate zopfli;
 
 use deflate::Deflaters;
-use error::PngError;
+pub use error::PngError;
 use image::{GenericImage, Pixel, ImageFormat};
 use headers::Headers;
 use png::PngData;
@@ -25,7 +25,7 @@ use std::path::{Path, PathBuf};
 
 pub mod colors;
 pub mod deflate;
-mod error;
+pub mod error;
 mod filters;
 pub mod headers;
 mod interlace;