diff --git a/lessons/01-Introduction-to-haskell.ipynb b/lessons/01-Introduction-to-haskell.ipynb
index 438d978..f245ffc 100644
--- a/lessons/01-Introduction-to-haskell.ipynb
+++ b/lessons/01-Introduction-to-haskell.ipynb
@@ -500,7 +500,7 @@
    },
    "outputs": [],
    "source": [
-    "greaterThan18 3"
+    "greaterThan18 30"
    ]
   },
   {
@@ -1100,4 +1100,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 4
-}
\ No newline at end of file
+}