diff --git a/notebooks/Quick_Primer_on_Colab_Jupyter.ipynb b/notebooks/Quick_Primer_on_Colab_Jupyter.ipynb
index 6076d05..0e2cfcd 100644
--- a/notebooks/Quick_Primer_on_Colab_Jupyter.ipynb
+++ b/notebooks/Quick_Primer_on_Colab_Jupyter.ipynb
@@ -684,7 +684,7 @@
         "id": "gLaqrP4PdcCc"
       },
       "source": [
-        "arr[1:3, 1:3]"
+        "arr[0:2, 1:3]"
       ],
       "execution_count": null,
       "outputs": []
@@ -973,7 +973,7 @@
         "id": "423eBp8ljQSI"
       },
       "source": [
-        "We can start by looking at the size of the dataframe:"
+        "We can start by looking at the shape of the dataframe:"
       ]
     },
     {
@@ -993,7 +993,7 @@
         "id": "YkaVVbXbjiFS"
       },
       "source": [
-        "This tells us that it contains four rows and each row has three columns. Let's look at the first two columns:"
+        "This tells us that it contains four rows and each row has three columns. Let's look at the first two rows:"
       ]
     },
     {
@@ -1558,7 +1558,7 @@
         "id": "P1EI7CsBp1uo"
       },
       "source": [
-        "Or in ascending order:"
+        "Or in descending order:"
       ]
     },
     {
@@ -1580,7 +1580,7 @@
       "source": [
         "#### Ranks\n",
         "\n",
-        "Ranking assigns rank from one through the number of valid data points in an array."
+        "Ranking replaces each valid value in a dataframe with its ordinal if the dataframe were sorted by that column (ties are given the mean of the ranks)."
       ]
     },
     {