diff --git a/README.md b/README.md
index 539d9d5e1..c3d1abee6 100644
--- a/README.md
+++ b/README.md
@@ -324,6 +324,7 @@ property | type | default | allowed | description
 `$maskPattern` | int | `QRCode::MASK_PATTERN_AUTO` | 0...7 | Mask Pattern to use
 `$addQuietzone` | bool | `true` | - | Add a "quiet zone" (margin) according to the QR code spec
 `$quietzoneSize` | int | 4 | clamped to 0 ... `$matrixSize / 2` | Size of the quiet zone
+`$dataMode` | string | `null` | `Number`, `AlphaNum`, `Kanji`, `Byte` | allows overriding the data type detection
 `$outputType` | string | `QRCode::OUTPUT_IMAGE_PNG` | `QRCode::OUTPUT_*` | built-in output type
 `$outputInterface` | string | `null` | * | FQCN of the custom `QROutputInterface` if `QROptions::$outputType` is set to `QRCode::OUTPUT_CUSTOM`
 `$cachefile` | string | `null` | * | optional cache file path