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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 f9b39b61d..5017165c0 100644
--- a/doc/ref/api-data.texi
+++ b/doc/ref/api-data.texi
@@ -4546,7 +4546,8 @@ Fill bytevector @var{bv} with @var{fill}, a byte.
@deffnx {C Function} scm_bytevector_copy_x (source, source_start, target, target_start, len)
Copy @var{len} bytes from @var{source} into @var{target}, starting
reading from @var{source-start} (a positive index within @var{source})
-and start writing at @var{target-start}.
+and start writing at @var{target-start}. It is permitted for the
+@var{source} and @var{target} regions to overlap.
@end deffn
@deffn {Scheme Procedure} bytevector-copy bv