diff --git a/README.md b/README.md
index 1887b67..3bd271e 100644
--- a/README.md
+++ b/README.md
@@ -87,6 +87,7 @@ This lives in my `~/projects/scripts` directory and is added to my `$PATH`. Not
 | snippy.sh               | Third-party. Helper script for i3 to let me create snippets and type them easily.                                                                                                   |
 | split-audio-by-chapters | Splits a audiobook by its various chapters. I added support for providing a chapters.txt file with chapter names in case the M4B file doesn't have correct names                    |
 | split-by-audible        | Similar to split-audio-by-chapters, but this one uses a different chapter-listing format, which is what you get when you copy the Audible tracklist from the Audible web player.    |
+| split-by-silence        | ffmpeg wrapper to use silence detection to split files. [Source](https://gist.github.com/vi/2fe3eb63383fcfdad7483ac7c97e9deb)
 | sql                     | Third-party. Runs SQL commands against different drivers based on DBURL. This is a GNU project                                                                                      |
 | ssl-cipher-test.sh      | Runs a SSL Cipher test by testing all available ciphers against an upstream server                                                                                                  |
 | stream-audio.sh         | Streams pulseaudio to RTSP                                                                                                                                                          |
diff --git a/split-by-audible b/split-by-audible
index 8a8b460..3af60a2 100755
--- a/split-by-audible
+++ b/split-by-audible
@@ -22,9 +22,16 @@ This is exactly what you'll get if you copy-paste the listing from the web playe
 Unfortunately, I've found that for very long Audiobooks, this isn't precise enough and the errors add up.
 */
 
+if(count($argv) != 3) {
+	die("Please run as split-by-audible audio.m4a listing.txt\n");
+}
+
 $INPUT_FILE=$argv[1];
 $listing=$argv[2];
 
+is_readable($INPUT_FILE) or die("$INPUT_FILE not readable\n");
+is_readable($listing) or die("$listing not readable\n");
+
 $startTime = 0;
 $inputData = file($listing);