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-rw-r--r--src/nvim/api/extmark.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/nvim/api/extmark.c b/src/nvim/api/extmark.c
index 6ec1fc4ee0..268fdded9a 100644
--- a/src/nvim/api/extmark.c
+++ b/src/nvim/api/extmark.c
@@ -1035,7 +1035,8 @@ void nvim_buf_clear_namespace(Buffer buffer, Integer ns_id, Integer line_start,
/// window callbacks)
/// ["buf", bufnr, tick]
/// - on_win: called when starting to redraw a
-/// specific window.
+/// specific window. botline_guess is an approximation
+/// that does not exceed the last line number.
/// ["win", winid, bufnr, topline, botline_guess]
/// - on_line: called for each buffer line being redrawn.
/// (The interaction with fold lines is subject to change)