diff --git a/docs/book/basics/simple_resource.md b/docs/book/basics/simple_resource.md
index 8973211fff2..1e79fcdd00f 100644
--- a/docs/book/basics/simple_resource.md
+++ b/docs/book/basics/simple_resource.md
@@ -66,7 +66,7 @@ To learn more about how to use annotations in kubebuilder, refer to [Using Annot
 
 The ContainerSetSpec contains the container image and replica count, which should be read by
 the controller and used to create and manage a new Deployment.  The Spec field contains desired
-state defined by the user or, if unspecified, field defaults defaults or Controllers set values.
+state defined by the user or, if unspecified, field defaults or Controllers set values.
 An example of an unspecified field that could be owned by a Controller would be the `replicas`
 field, which may be set by autoscalers.
 
diff --git a/docs/book/public/basics/simple_resource.html b/docs/book/public/basics/simple_resource.html
index 8632752dfcc..77e95596c91 100644
--- a/docs/book/public/basics/simple_resource.html
+++ b/docs/book/public/basics/simple_resource.html
@@ -732,7 +732,7 @@ <h4 id="reference">Reference</h4>
 <div class="api-method"><div class="api-method-definition"><h2 id="containersetspec">ContainerSetSpec</h2>
 <p>The ContainerSetSpec contains the container image and replica count, which should be read by
 the controller and used to create and manage a new Deployment.  The Spec field contains desired
-state defined by the user or, if unspecified, field defaults defaults or Controllers set values.
+state defined by the user or, if unspecified, field defaults or Controllers set values.
 An example of an unspecified field that could be owned by a Controller would be the <code>replicas</code>
 field, which may be set by autoscalers.</p>
 </div><div class="api-method-code"><div class="api-method-sample" data-lang="go" data-name="Go"><pre><code class="lang-go"><span class="hljs-comment">// ContainerSetSpec defines the desired state of ContainerSet</span>