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-rw-r--r--doc/ref/api-data.texi3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/ref/api-data.texi b/doc/ref/api-data.texi
index ed14b2298..2ad13f5a5 100644
--- a/doc/ref/api-data.texi
+++ b/doc/ref/api-data.texi
@@ -5924,7 +5924,8 @@ that modifying the elements of the new list also modifies the elements
of the old list. On the other hand, applying procedures like
@code{set-cdr!} or @code{delv!} to the new list will not alter the old
list. If you also need to copy the list elements (making a deep copy),
-use the procedure @code{copy-tree} (@pxref{Copying}).
+use the procedure @code{copy-tree} from @code{(ice-9 copy-tree)}
+(@pxref{Copying}).
@node List Selection
@subsubsection List Selection