diff --git a/README.md b/README.md
index f555918..5fd7db3 100644
--- a/README.md
+++ b/README.md
@@ -57,25 +57,27 @@ cd extract_otp_secret_keys
 
 ## Program help: arguments and options
 
-<pre>usage: extract_otp_secrets.py [-h] [--camera NUMBER] [--json FILE] [--csv FILE] [--keepass FILE] [--printqr] [--saveqr DIR] [--verbose | --quiet] [infile ...]
+<pre>usage: extract_otp_secrets.py [-h] [--camera NUMBER] [--qr {QREADER,DEEP_QREADER,ZBAR,CV2,WECHAT}] [--json FILE] [--csv FILE] [--keepass FILE] [--printqr] [--saveqr DIR] [--verbose | --quiet] [infile ...]
 
 Extracts one time password (OTP) secret keys from QR codes, e.g. from Google Authenticator app.
 If no infiles are provided, the QR codes are interactively captured from the camera.
 
 positional arguments:
-  infile                      a) file or - for stdin with 'otpauth-migration://...' URLs separated by newlines, lines starting with # are ignored;
-                              b) image file containing a QR code or = for stdin for an image containing a QR code
+  infile                                            a) file or - for stdin with 'otpauth-migration://...' URLs separated by newlines, lines starting with # are ignored;
+                                                    b) image file containing a QR code or = for stdin for an image containing a QR code
 
 options:
-  -h, --help                  show this help message and exit
-  --camera NUMBER, -C NUMBER  camera number of system (default camera: 0)
-  --json FILE, -j FILE        export json file or - for stdout
-  --csv FILE, -c FILE         export csv file or - for stdout
-  --keepass FILE, -k FILE     export totp/hotp csv file(s) for KeePass, - for stdout
-  --printqr, -p               print QR code(s) as text to the terminal (requires qrcode module)
-  --saveqr DIR, -s DIR        save QR code(s) as images to the given folder (requires qrcode module)
-  --verbose, -v               verbose output
-  --quiet, -q                 no stdout output, except output set by -
+  -h, --help                                        show this help message and exit
+  --camera NUMBER, -C NUMBER                        camera number of system (default camera: 0)
+  --qr {QREADER,DEEP_QREADER,ZBAR,CV2,WECHAT}, -Q {QREADER,DEEP_QREADER,ZBAR,CV2,WECHAT}
+                                                    QR reader (default: ZBAR)
+  --json FILE, -j FILE                              export json file or - for stdout
+  --csv FILE, -c FILE                               export csv file or - for stdout
+  --keepass FILE, -k FILE                           export totp/hotp csv file(s) for KeePass, - for stdout
+  --printqr, -p                                     print QR code(s) as text to the terminal (requires qrcode module)
+  --saveqr DIR, -s DIR                              save QR code(s) as images to the given folder (requires qrcode module)
+  --verbose, -v                                     verbose output
+  --quiet, -q                                       no stdout output, except output set by -
 
 examples:
 python extract_otp_secrets.py