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-rw-r--r--doc/refman/Polynom.tex4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/refman/Polynom.tex b/doc/refman/Polynom.tex
index f50a0e4f29..32142112c4 100644
--- a/doc/refman/Polynom.tex
+++ b/doc/refman/Polynom.tex
@@ -526,7 +526,9 @@ Reset Initial.
{\ldots} \term$_n$ has to be a proof of some equality $m = p$,
where $m$ is a monomial (after ``abstraction''),
$p$ a polynomial and $=$ the corresponding equality of the field structure.
-
+ Beware that rewriting works with the equality $m=p$ only if $p$ is a
+ polynomial since rewriting is handled by the underlying {\tt ring}
+ tactic.
\item {\tt field\_simplify}
performs the simplification in the conclusion of the goal, $F_1 = F_2$
becomes $N_1/D_1 = N_2/D_2$. A normalization step (the same as the