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-rw-r--r--doc/refman/CanonicalStructures.tex4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/refman/CanonicalStructures.tex b/doc/refman/CanonicalStructures.tex
index 7b3bdcf4a9..b1c278cede 100644
--- a/doc/refman/CanonicalStructures.tex
+++ b/doc/refman/CanonicalStructures.tex
@@ -305,8 +305,10 @@ canonical structures.
We need some infrastructure for that.
-\begin{coq_example}
+\begin{coq_example*}
Require Import Strings.String.
+\end{coq_example*}
+\begin{coq_example}
Module infrastructure.
Inductive phantom {T : Type} (t : T) : Type := Phantom.
Definition unify {T1 T2} (t1 : T1) (t2 : T2) (s : option string) :=