diff --git a/docs/lang/articles/math/linear_solver.md b/docs/lang/articles/math/linear_solver.md
index 3b585def9bc05..cd852e4d48a93 100644
--- a/docs/lang/articles/math/linear_solver.md
+++ b/docs/lang/articles/math/linear_solver.md
@@ -31,7 +31,7 @@ K = ti.linalg.SparseMatrixBuilder(n, n, max_num_triplets=100)
 b = ti.ndarray(ti.f32, shape=n)
 
 @ti.kernel
-def fill(A: ti.types.sparse_matrix_builder(), b: ti.template(), interval: ti.i32):
+def fill(A: ti.types.sparse_matrix_builder(), b: ti.types.ndarray(), interval: ti.i32):
     for i in range(n):
         A[i, i] += 2.0
 
diff --git a/docs/lang/articles/math/sparse_matrix.md b/docs/lang/articles/math/sparse_matrix.md
index c26398eb4f375..780ae4c08d390 100644
--- a/docs/lang/articles/math/sparse_matrix.md
+++ b/docs/lang/articles/math/sparse_matrix.md
@@ -56,7 +56,7 @@ print(A)
 
 The basic operations like `+`, `-`, `*`, `@` and transpose of sparse matrices are supported now.
 
-```python
+```python cont
 print(">>>> Summation: C = A + A")
 C = A + A
 print(C)