diff --git a/100_Numpy_exercises_with_hints_with_solutions.md b/100_Numpy_exercises_with_hints_with_solutions.md
index 8707654..409c00f 100644
--- a/100_Numpy_exercises_with_hints_with_solutions.md
+++ b/100_Numpy_exercises_with_hints_with_solutions.md
@@ -38,9 +38,6 @@ print(Z)
 ```python
 Z = np.zeros((10,10))
 print("%d bytes" % (Z.size * Z.itemsize))
-
-# Simpler alternative
-print("%d bytes" % Z.nbytes)
 ```
 #### 5. How to get the documentation of the numpy add function from the command line? (★☆☆)
 `hint: np.info`
diff --git a/100_Numpy_exercises_with_solutions.md b/100_Numpy_exercises_with_solutions.md
index a984caa..c7285d2 100644
--- a/100_Numpy_exercises_with_solutions.md
+++ b/100_Numpy_exercises_with_solutions.md
@@ -38,9 +38,6 @@ print(Z)
 ```python
 Z = np.zeros((10,10))
 print("%d bytes" % (Z.size * Z.itemsize))
-
-# Simpler alternative
-print("%d bytes" % Z.nbytes)
 ```
 #### 5. How to get the documentation of the numpy add function from the command line? (★☆☆)