diff --git a/src/lib.rs b/src/lib.rs
index 4f92e88..378376a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -23,6 +23,22 @@ const COLOR_RESET: &[u8] = colors::Default::ANSI_FG.as_bytes();
 
 #[rustfmt::skip]
 const CP437: [char; 256] = [
+    // Copyright (c) 2016, Delan Azabani <delan@azabani.com>
+    //
+    // Permission to use, copy, modify, and/or distribute this software for any
+    // purpose with or without fee is hereby granted, provided that the above
+    // copyright notice and this permission notice appear in all copies.
+    //
+    // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+    // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+    // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+    //
+    // modified to use the ⋄ character instead of nul
+
     // use https://en.wikipedia.org/w/index.php?title=Code_page_437&oldid=978947122
     // not ftp://ftp.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/PC/CP437.TXT
     // because we want the graphic versions of 01h–1Fh + 7Fh