diff --git a/official/证验码/README.md b/official/证验码/README.md
index af6144e..a3b1797 100644
--- a/official/证验码/README.md
+++ b/official/证验码/README.md
@@ -56,7 +56,7 @@ A = np.array([count_pix(img_generate(c)) for c in alphabet])
 # pix sum vector, shape: (255, )
 b = count_pix(img)
 
-# Solve A^T.x = b using least-squares mathod
+# Solve A^T.x = b using least-squares method
 xf, *_ = np.linalg.lstsq(A.T, b, rcond=None)
 
 # number matrix, shape: (62, )
@@ -69,4 +69,4 @@ x = xf.round().astype(np.int).tolist()
 
 ## 完整程序
 
-见 [payload.py](payload.py)。
\ No newline at end of file
+见 [payload.py](payload.py)。