diff --git a/peps/pep-0825.rst b/peps/pep-0825.rst
index e3ae58a4a74..e73eac1a22a 100644
--- a/peps/pep-0825.rst
+++ b/peps/pep-0825.rst
@@ -741,6 +741,10 @@ Note that steps 4. through 8. are introduced specifically for variant
 wheels. The remaining steps correspond to the current installer
 behavior.
 
+When installing from a source that does not provide an `index-level
+metadata`_, the same algorithm can be used, except that the variant
+metadata needs to be read directly from the wheels.
+
 
 Installing a local wheel
 ''''''''''''''''''''''''