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-rw-r--r--doc/develop/expo.rst2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/develop/expo.rst b/doc/develop/expo.rst
index cc7c36173db..8f63ccbe3ef 100644
--- a/doc/develop/expo.rst
+++ b/doc/develop/expo.rst
@@ -65,6 +65,8 @@ item is highlighted.
A `textline object` contains a label and an editable string.
+A `box object` is a rectangle with a given line width. It is not filled.
+
All components have a name. This is mostly for debugging, so it is easy to see
what object is referred to, although the name is also used for saving values.
Of course the ID numbers can help as well, but they are less easy to