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-rw-r--r--doc/refman/Universes.tex4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/refman/Universes.tex b/doc/refman/Universes.tex
index a08cd1475a..36518e6fae 100644
--- a/doc/refman/Universes.tex
+++ b/doc/refman/Universes.tex
@@ -201,7 +201,8 @@ universes and explicitly instantiate polymorphic definitions.
In the monorphic case, this command declares a new global universe named
{\ident}. It supports the polymorphic flag only in sections, meaning the
universe quantification will be discharged on each section definition
-independently.
+independently. One cannot mix polymorphic and monomorphic declarations
+in the same section.
\subsection{\tt Constraint {\ident} {\textit{ord}} {\ident}.
\comindex{Constraint}
@@ -212,6 +213,7 @@ The order relation can be one of $<$, $\le$ or $=$. If consistent,
the constraint is then enforced in the global environment. Like
\texttt{Universe}, it can be used with the \texttt{Polymorphic} prefix
in sections only to declare constraints discharged at section closing time.
+One cannot declare a global constraint on polymorphic universes.
\begin{ErrMsgs}
\item \errindex{Undeclared universe {\ident}}.