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-rw-r--r--doc/sphinx/proof-engine/tactics.rst12
1 files changed, 12 insertions, 0 deletions
diff --git a/doc/sphinx/proof-engine/tactics.rst b/doc/sphinx/proof-engine/tactics.rst
index 8989dd29ab..78ac7d00dd 100644
--- a/doc/sphinx/proof-engine/tactics.rst
+++ b/doc/sphinx/proof-engine/tactics.rst
@@ -36,6 +36,18 @@ language will be described in Chapter :ref:`ltac`.
Common elements of tactics
--------------------------
+Reserved keywords
+~~~~~~~~~~~~~~~~~
+
+The tactics described in this chapter reserve the following keywords::
+
+ by using
+
+Thus, these keywords cannot be used as identifiers. It also declares
+the following character sequences as tokens::
+
+ ** [= |-
+
.. _invocation-of-tactics:
Invocation of tactics