diff --git a/Python/Module3_IntroducingNumpy/AdvancedIndexing.md b/Python/Module3_IntroducingNumpy/AdvancedIndexing.md
index 769b5373..a6ef69fd 100644
--- a/Python/Module3_IntroducingNumpy/AdvancedIndexing.md
+++ b/Python/Module3_IntroducingNumpy/AdvancedIndexing.md
@@ -695,6 +695,13 @@ This will return a tuple of two integer-valued index-arrays. These contain the i
 ...               [ 0.84,  0.76,  0.25,  0.07]])
 
 >>> x[np.arange(4), np.arange(4)] = range(4)
+# equivalent (works for the general case of a square matrix of N-dims)
+# x[tuple(np.arange(x) for x in x.shape)] = range(x.shape[0])
+
+# equivalent (using numpy built-in functions):
+# x[np.diag_indices_from(x)] = np.arange(4)
+# np.fill_diagonal(x, np.arange(4))
+
 >>> x[0.8 < x] += 1
 >>> x
 array([[ 0.  ,  0.05,  1.84,  0.21],
diff --git a/Python/Module4_OOP/Methods.md b/Python/Module4_OOP/Methods.md
index 92d9723a..6bf8e4fc 100644
--- a/Python/Module4_OOP/Methods.md
+++ b/Python/Module4_OOP/Methods.md
@@ -200,7 +200,7 @@ __main__.Dummy
 `dict.fromkeys` is an example of a class method that takes in an iterable, and returns a dictionary whose keys are the elements of that iterable, and whose values all default to `None`.
 
 ```python
->>> dict.fromkeys("abcd")
+>>> dict.fromkeys("abcd", 2.3)
 {'a': 2.3, 'b': 2.3, 'c': 2.3, 'd': 2.3}
 ```
 
diff --git a/README.md b/README.md
index f1170581..d1929075 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ Once this environment is created activate it. You may need to manually install a
 
 ```shell
 pip install sphinx-rtd-theme==0.4.3
-pip install jupytext-1.3.0rc1
+pip install jupytext==1.4.2
 ```
 
 and install the `plymi` code base from this repo. Clone the present repository and run: