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-rw-r--r--src/surface.zig4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/surface.zig b/src/surface.zig
index b19c24c7..fec43e30 100644
--- a/src/surface.zig
+++ b/src/surface.zig
@@ -357,7 +357,9 @@ pub const Region = struct {
/// The pane or column has the keyboard's focus.
active: bool = false,
/// A rail's thumb: rows from the rail's top, and how many. Zero rows is
- /// a rail with no thumb (an image).
+ /// a rail with no thumb (an image). A native PDF's thumb is measured in
+ /// document pixels and filled in by Pdf.draw while it paints, so read
+ /// regions once render has returned.
thumb_y: u16 = 0,
thumb_h: u16 = 0,
/// A notice's index in its pane's `notices`.