From c6cabd1ff266a91022eb86caf4a99e89c0626430 Mon Sep 17 00:00:00 2001
From: Fabian Kunze
Date: Fri, 27 Nov 2020 11:11:23 +0100
Subject: Improved error message on nested proofs to include most common reason
 when this happens on accident

---
 doc/sphinx/language/core/definitions.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'doc')

diff --git a/doc/sphinx/language/core/definitions.rst b/doc/sphinx/language/core/definitions.rst
index 57771c9036..ee6679a29a 100644
--- a/doc/sphinx/language/core/definitions.rst
+++ b/doc/sphinx/language/core/definitions.rst
@@ -173,7 +173,8 @@ Chapter :ref:`Tactics`. The basic assertion command is:
       The name you provided is already defined. You have then to choose
       another name.
 
-   .. exn:: Nested proofs are not allowed unless you turn the Nested Proofs Allowed flag on.
+   .. exn:: Nested proofs are discouraged and not allowed by default. This error probably means that you forgot to close the last "Proof." with "Qed." or "Defined.". \
+            If you really intended to use nested proofs, you can do so by turning the "Nested Proofs Allowed" flag on.
 
       You are asserting a new statement while already being in proof editing mode.
       This feature, called nested proofs, is disabled by default.
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