diff --git a/README.md b/README.md
index ebe6478..1e00488 100644
--- a/README.md
+++ b/README.md
@@ -181,9 +181,9 @@ Positional parameter
 Optional parameters
    version: int, from 1 to 40
    level: str, just one of ('L','M','Q','H')
-   picutre: str, a filename of a image
+   picture: str, a filename of a image
    colorized: bool
-   constrast: float
+   contrast: float
    brightness: float
    save_name: str, the output filename like 'example.png'
    save_dir: str, the output directory