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diff --git a/src/content/chapter0_basics/lesson09_bools/code.gleam b/src/content/chapter0_basics/lesson09_bools/code.gleam
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+import gleam/io
+import gleam/bool
+
+pub fn main() {
+  // Bool operators
+  io.debug(True && False)
+  io.debug(True && True)
+  io.debug(False || False)
+  io.debug(False || True)
+
+  // Bool functions
+  io.debug(bool.to_string(True))
+  io.debug(bool.to_int(False))
+}
diff --git a/src/content/chapter0_basics/lesson09_bools/text.html b/src/content/chapter0_basics/lesson09_bools/text.html
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+<p>
+  A <code>Bool</code> is a either <code>True</code> or <code>False</code>.
+</p>
+<p>
+  The <code>||</code>, <code>&&</code>, and <code>!</code> operators can be used
+  to manipulate bools.
+</p>
+<p>
+  The <code>||</code> and <code>&&</code> operators are short-circuiting,
+  meaning that if the left hand side of the operator is <code>True</code> for
+  <code>||</code> or <code>False</code> for <code>&&</code> then the right hand
+  side of the operator will not be evaluated.
+</p>
+<p>
+  The <a href="https://hexdocs.pm/gleam_stdlib/gleam/bool.html"><code>gleam/bool</code></a>
+  standard library module contains functions for working with bools.
+</p>