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-rw-r--r--doc/lispref/display.texi4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index 92bfd2fea19..1460e070a0a 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -2138,7 +2138,9 @@ height of all of these lines, if present, in the return value.
The optional argument @var{ignore-line-at-end} controls whether or
not to count the height of text in @var{to}'s screen line as part of
-the returned pixel-height.
+the returned pixel-height. This is useful if your Lisp program is
+only interested in the dimensions of text up to and excluding the
+visual beginning of @var{to}'s screen line.
@code{window-text-pixel-size} treats the text displayed in a window as a
whole and does not care about the size of individual lines. The