diff --git a/AAXtoMP3 b/AAXtoMP3
index d1bb0a3..e53b8de 100755
--- a/AAXtoMP3
+++ b/AAXtoMP3
@@ -17,7 +17,7 @@ if ! [[ $(type -P "$GREP") ]]; then
 fi
 
 if [ "$#" -eq 0 ]; then
-        echo "Usage: bash AXtoMP3.sh [--flac] [--opus ] [--single] AUTHCODE {FILES}"
+        echo "Usage: bash AXtoMP3 [--flac] [--aac] [--opus ] [--single] AUTHCODE {FILES}"
         echo "	Note that order does matter!"
         exit 1
 fi
@@ -29,12 +29,12 @@ then
     shift
 fi
 
-#if [[ "$1" == '--aac' ]]
-#then
-#    codec=copy
-#    extension=m4b
-#    shift
-#fi
+if [[ "$1" == '--aac' ]]
+then
+    codec=copy
+    extension=m4a
+    shift
+fi
 
 if [[ "$1" = '--opus' ]]
 then
diff --git a/README.md b/README.md
index dd2cdfd..3ce72dc 100644
--- a/README.md
+++ b/README.md
@@ -30,16 +30,15 @@ conversions in OSX. It is recommended that you install GNU grep using 'brew inst
 Thanks to kbabioch, this script has also been packaged in the [AUR](https://aur.archlinux.org/packages/aaxtomp3-git/). Note that you will still need to extract your activation bytes before use.
 
 ## Usage
-```
-bash AAXtoMP3 [--flac] [--opus] [--single] AUTHCODE {FILES}
+```bash
+bash AAXtoMP3 [--flac] [--aac] [--opus] [--single] AUTHCODE {FILES}
 ```
 * AUTHCODE: **your** Audible auth code (it won't correctly decode otherwise) (required)
 * Everything else is considered an input file, useful for batching!
 
 Note that any optional flags have to be inputed *in order* to function correctly.
 
-Additionally, if you have a .authcode file available in the current working directory, it will read the first line of
-that line and treat it like your auth_code. When you do this you do not need to specify an AUTHCODE input.
+Additionally, if you have a .authcode file available in either your home directory or the current working directory, it will read the first line of that line and treat it like your auth_code. When you do this you do not need to specify an AUTHCODE input.
 
 ## Anti-Piracy Notice
 Note that this project does NOT ‘crack’ the DRM. It simply allows the user to