diff --git a/docs/plat/socionext-uniphier.rst b/docs/plat/socionext-uniphier.rst
index 964dd1d..9288193 100644
--- a/docs/plat/socionext-uniphier.rst
+++ b/docs/plat/socionext-uniphier.rst
@@ -80,7 +80,8 @@
 - Trusted Board Boot
 
   `mbed TLS`_ is needed as the cryptographic and image parser modules.
-  Refer to the :ref:`User Guide` for the appropriate version of mbed TLS.
+  Refer to the :ref:`Prerequisites` document for the appropriate version of
+  mbed TLS.
 
   To enable TBB, add the following options to the build command::