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diff --git a/src/content/chapter1_functions/lesson03_higher_order_functions/code.gleam b/src/content/chapter1_functions/lesson03_higher_order_functions/code.gleam
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+++ b/src/content/chapter1_functions/lesson03_higher_order_functions/code.gleam
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+import gleam/io
+
+pub fn main() {
+  // Call a function with another function
+  io.debug(twice(1, add_one))
+
+  // Functions can be assigned to variables
+  let function = add_one
+  io.debug(function(100))
+}
+
+fn twice(argument: Int, function: fn(Int) -> Int) -> Int {
+  function(function(argument))
+}
+
+fn add_one(argument: Int) -> Int {
+  argument + 1
+}
diff --git a/src/content/chapter1_functions/lesson03_higher_order_functions/text.html b/src/content/chapter1_functions/lesson03_higher_order_functions/text.html
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+<p>
+  In Gleam functions are values. They can be assigned to variables, passed to
+  other functions, and anything else you can do with values.
+</p>
+<p>
+  Here the function <code>add_one</code> is being passed as an argument to the
+  <code>twice</code> function.
+</p>
+<p>
+  Notice the <code>fn</code> keyword is also used to describe the type of the
+  function that <code>twice</code> takes as its second argument.
+</p>