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-rw-r--r--doc/sphinx/proof-engine/tactics.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/sphinx/proof-engine/tactics.rst b/doc/sphinx/proof-engine/tactics.rst
index fa6d62ffa2..85dfe0e5d2 100644
--- a/doc/sphinx/proof-engine/tactics.rst
+++ b/doc/sphinx/proof-engine/tactics.rst
@@ -3960,6 +3960,9 @@ At Coq startup, only the core database is nonempty and can be used.
:fset: internal database for the implementation of the ``FSets`` library.
+:ordered_type: lemmas about ordered types (as defined in the legacy ``OrderedType`` module),
+ mainly used in the ``FSets`` and ``FMaps`` libraries.
+
You are advised not to put your own hints in the core database, but
use one or several databases specific to your development.