diff --git a/src/ldpc/mod2.py b/src/ldpc/mod2.py
index f9d1741..ae66169 100755
--- a/src/ldpc/mod2.py
+++ b/src/ldpc/mod2.py
@@ -249,7 +249,7 @@ def reduced_row_echelon(matrix):
     return [reduced_row_echelon_form, matrix_rank, transform_matrix_rows, transform_matrix_columns]
 
 def nullspace(matrix):
-    """
+    r"""
     Computes the nullspace of the matrix M. Also sometimes referred to as the kernel.
 
     All vectors x in the nullspace of M satisfy the following condition::
@@ -443,4 +443,4 @@ def row_basis(matrix):
 
     # H=np.array([[1,1,0],[0,1,1],[1,0,1]])
 
-    print(codewords(H))
\ No newline at end of file
+    print(codewords(H))