diff --git a/docs/getting_started/porting-guide.rst b/docs/getting_started/porting-guide.rst
index bfe0031..d49ddeb 100644
--- a/docs/getting_started/porting-guide.rst
+++ b/docs/getting_started/porting-guide.rst
@@ -89,6 +89,8 @@
 The following variables, functions and constants must be defined by the platform
 for the firmware to work correctly.
 
+.. _platform_def_mandatory:
+
 File : platform_def.h [mandatory]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~