Document that tox errors when using -U when defining deps

This fixes #2631.
tox-dev · Dec 8, 2022 · 94ed9b2 · 94ed9b2
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diff --git a/docs/changelog/2631.doc.rst b/docs/changelog/2631.doc.rst
@@ -0,0 +1 @@
+Document that tox v4 errors when using ``-U`` when defining dependencies via ``deps``  - by :user:`jugmac00`.
diff --git a/docs/faq.rst b/docs/faq.rst
@@ -44,6 +44,10 @@ tox 4 - changed INI rules
           ALPHA
           BETA
 
+- tox 4 now errors when using the ``-U`` flag when defining dependencies, e.g. ``deps = -Ur requirements.txt``. While
+  this worked in tox 3, it was never supported officially. Additionally, in the context of a new virtual environment
+  this flag makes no sense anyway.
+
 tox 4 - known regressions
 +++++++++++++++++++++++++