diff --git a/doc/en/assert.rst b/doc/en/assert.rst
index e0e9b9305..76cd66e41 100644
--- a/doc/en/assert.rst
+++ b/doc/en/assert.rst
@@ -264,8 +264,12 @@ Advanced assertion introspection
 Reporting details about a failing assertion is achieved by rewriting assert
 statements before they are run.  Rewritten assert statements put introspection
 information into the assertion failure message.  ``pytest`` only rewrites test
-modules directly discovered by its test collection process, so asserts in
-supporting modules which are not themselves test modules will not be rewritten.
+modules directly discovered by its test collection process, so **asserts in
+supporting modules which are not themselves test modules will not be rewritten**.
+
+You can manually enable assertion rewriting for an imported module by calling 
+`register_assert_rewrite<https://docs.pytest.org/en/latest/writing_plugins.html#assertion-rewriting>`
+before you import it.
 
 .. note::