diff --git a/227-8.py b/227-8.py
index e31aa58..f8abc89 100644
--- a/227-8.py
+++ b/227-8.py
@@ -19,7 +19,7 @@ def Dot(A,B):
         return None
     return [[sum([A[i][j] * B[j][k] for j in range(len(A[0]))]) for k in range(len(B[0]))] for i in range(len(A))]
         
-
+#改成题干的矩阵##########################
 if __name__ == "__main__":
     A = [[1, 3], [-2, 4]]
     x = [[1], [-1]]
diff --git a/228-12.py b/228-12.py
index dde776c..130c77c 100644
--- a/228-12.py
+++ b/228-12.py
@@ -51,6 +51,7 @@ def Det(A):
         det += ((-1) ** c) * A[0][c] * Det(sub_matrix)
     return det
 
+#把矩阵换成题干的矩阵#########################
 if __name__ == "__main__":
     A =[
         [1,0,1],