diff --git a/docs/user/intro.rst b/docs/user/intro.rst
index 2f66e4e6..c40528de 100644
--- a/docs/user/intro.rst
+++ b/docs/user/intro.rst
@@ -17,6 +17,7 @@ Requests was developed with a few :pep:`20` idioms in mind.
 
 All contributions to Requests should keep these important rules in mind.
 
+.. _`isc`:
 
 ISC License
 -----------