diff --git a/100-pandas-puzzles-with-solutions.ipynb b/100-pandas-puzzles-with-solutions.ipynb
index d2467b934..0b5927d3d 100644
--- a/100-pandas-puzzles-with-solutions.ipynb
+++ b/100-pandas-puzzles-with-solutions.ipynb
@@ -356,7 +356,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "**18.** Sort `df` first by the values in the 'age' in *decending* order, then by the value in the 'visit' column in *ascending* order (so row `i` should be first, and row `d` should be last)."
+    "**18.** Sort `df` first by the values in the 'age' in *decending* order, then by the value in the 'visits' column in *ascending* order (so row `i` should be first, and row `d` should be last)."
    ]
   },
   {
diff --git a/100-pandas-puzzles.ipynb b/100-pandas-puzzles.ipynb
index d067e54bf..bcafc2be8 100644
--- a/100-pandas-puzzles.ipynb
+++ b/100-pandas-puzzles.ipynb
@@ -342,7 +342,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "**18.** Sort `df` first by the values in the 'age' in *decending* order, then by the value in the 'visit' column in *ascending* order (so row `i` should be first, and row `d` should be last)."
+    "**18.** Sort `df` first by the values in the 'age' in *decending* order, then by the value in the 'visits' column in *ascending* order (so row `i` should be first, and row `d` should be last)."
    ]
   },
   {