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-rw-r--r--doc/sphinx/proof-engine/tactics.rst2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/sphinx/proof-engine/tactics.rst b/doc/sphinx/proof-engine/tactics.rst
index 7b395900e9..afb0239be4 100644
--- a/doc/sphinx/proof-engine/tactics.rst
+++ b/doc/sphinx/proof-engine/tactics.rst
@@ -3912,6 +3912,8 @@ At Coq startup, only the core database is nonempty and can be used.
environment, including those used for ``setoid_rewrite``,
from the Classes directory.
+:fset: internal database for the implementation of the ``FSets`` library.
+
You are advised not to put your own hints in the core database, but
use one or several databases specific to your development.