diff --git a/content/blog/stack_recursion.md b/content/blog/stack_recursion.md
index 5f807f5..7b99e3e 100644
--- a/content/blog/stack_recursion.md
+++ b/content/blog/stack_recursion.md
@@ -261,7 +261,12 @@ As before, we push the desired answer onto the stack:
 {{< stack >}}
     {{< stack_element >}}{{< /stack_element >}}
     {{< stack_element >}}1{{< /stack_element >}}
-    {{< stack_element >}}\(n\){{< /stack_element >}}
+    {{< stack_element >}}
+        {{< sidenote "right" "zero-note" "\(n\)" >}}
+        At this point, we know that \(n\) is equal to 0. However, for the sake of consistency,
+        and to avoid confusion, I do not substitute 0 here.
+        {{< /sidenote >}}
+    {{< /stack_element >}}
     {{< stack_element >}}factorial{{< /stack_element >}}
 {{< /stack >}}