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-rw-r--r--doc/lispref/frames.texi2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/lispref/frames.texi b/doc/lispref/frames.texi
index a15511dc9f5..f4316b753d8 100644
--- a/doc/lispref/frames.texi
+++ b/doc/lispref/frames.texi
@@ -1802,6 +1802,8 @@ Geometry}).
@item child-frame-border-width
The width in pixels of the frame's internal border (@pxref{Frame
Geometry}) if the given frame is a child frame (@pxref{Child Frames}).
+If this is @code{nil}, the value specified by the
+@code{internal-border-width} parameter is used instead.
@vindex vertical-scroll-bars@r{, a frame parameter}
@item vertical-scroll-bars