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-rw-r--r--doc/sphinx/proof-engine/tactics.rst5
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/sphinx/proof-engine/tactics.rst b/doc/sphinx/proof-engine/tactics.rst
index 7b47da885..9b4d724e0 100644
--- a/doc/sphinx/proof-engine/tactics.rst
+++ b/doc/sphinx/proof-engine/tactics.rst
@@ -2812,7 +2812,10 @@ the conversion in hypotheses :n:`{+ @ident}`.
:g:`(t t`:sub:`1` :g:`... t`:sub:`n` :g:`)` according to :math:`\beta`:math:`\iota`:math:`\zeta`-reduction rules.
.. exn:: Not reducible.
+ :undocumented:
+
.. exn:: No head constant to reduce.
+ :undocumented:
.. tacn:: hnf
:name: hnf
@@ -2862,7 +2865,7 @@ the conversion in hypotheses :n:`{+ @ident}`.
+ A constant can be marked to be unfolded only if applied to enough
arguments. The number of arguments required can be specified using the
- ``/`` symbol in the argument list of the ``Arguments`` vernacular command.
+ ``/`` symbol in the argument list of the :cmd:`Arguments` vernacular command.
.. example::
.. coqtop:: all