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-rw-r--r--doc/sphinx/proof-engine/tactics.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/sphinx/proof-engine/tactics.rst b/doc/sphinx/proof-engine/tactics.rst
index ec085a71e5..89668a2d7e 100644
--- a/doc/sphinx/proof-engine/tactics.rst
+++ b/doc/sphinx/proof-engine/tactics.rst
@@ -3976,7 +3976,7 @@ succeeds, and results in an error otherwise.
This tactic checks whether its arguments are unifiable, potentially
instantiating existential variables.
-.. exn:: Not unifiable.
+.. exn:: Unable to unify @term with @term.
.. tacv:: unify @term @term with @ident