diff --git a/docs/manual/src/docbook/appendix-dependencies.xml b/docs/manual/src/docbook/appendix-dependencies.xml
index 8a8b0ac179..bfe0181a67 100644
--- a/docs/manual/src/docbook/appendix-dependencies.xml
+++ b/docs/manual/src/docbook/appendix-dependencies.xml
@@ -413,4 +413,11 @@
         </para>
     </section>
 
+    <section>
+        <title><literal>spring-security-crypto</literal></title>
+        <para>Provides convenient cryptographic APIs which are used by projects such as OAuth.
+            This module currently has no external dependencies.
+        </para>
+    </section>
+
 </appendix>
\ No newline at end of file
diff --git a/docs/manual/src/docbook/introduction.xml b/docs/manual/src/docbook/introduction.xml
index e669685b21..320f006b83 100644
--- a/docs/manual/src/docbook/introduction.xml
+++ b/docs/manual/src/docbook/introduction.xml
@@ -282,6 +282,12 @@
                     external OpenID server. <literal>org.springframework.security.openid</literal>.
                     Requires OpenID4Java.</para>
             </section>
+            <section xml:id="spring-security-crypto">
+                <title>Crypto - <literal>spring-security-crypto.jar</literal></title>
+                <para>Contains cryptography utility functions which are used by other
+                    Spring projects. <literal>org.springframework.security.crypto</literal>.
+                </para>
+            </section>
         </section>
         <section xml:id="get-source">
             <title>Checking out the Source</title>