diff --git a/apps/ely-show/src/output/dialog.rs b/apps/ely-show/src/output/dialog.rs
index 2a734c5..8b5c282 100644
--- a/apps/ely-show/src/output/dialog.rs
+++ b/apps/ely-show/src/output/dialog.rs
@@ -13,6 +13,11 @@ use super::{Kind, Output, Range};
 use crate::deck::Deck;
 use crate::dialog::Dialog;
 
+/// A typed slide number on the deck; 0 means all.
+fn slide_number(value: f64, last: u32) -> u32 {
+    value.round().clamp(1.0, f64::from(last.max(1))) as u32
+}
+
 /// What goes out, which slides, how many a page.
 pub fn output_dialog(
     this: gpui::Entity<Deck>,
@@ -79,7 +84,7 @@ pub fn output_dialog(
     let bound = |id: &'static str, value: u32, first: bool| {
         // A typed number counts before blur commits it.
         let set = move |this: &gpui::Entity<Deck>, value: f64, cx: &mut gpui::App| {
-            let value = value.round() as u32;
+            let value = slide_number(value, last);
             change(this, cx, &|output| {
                 if let Range::Slides(from, to) = &mut output.range {
                     *(if first { from } else { to }) = value;
@@ -135,3 +140,16 @@ pub fn output_dialog(
                 .on_click(move |_, _, cx| this.update(cx, |deck, cx| deck.output(cx)))
         })
 }
+
+#[cfg(test)]
+mod tests {
+    use super::slide_number;
+
+    #[test]
+    fn a_typed_number_stays_on_the_deck() {
+        assert_eq!(slide_number(0.0, 5), 1, "0 would export every slide");
+        assert_eq!(slide_number(-3.0, 5), 1);
+        assert_eq!(slide_number(2.6, 5), 3);
+        assert_eq!(slide_number(9.0, 5), 5);
+    }
+}
diff --git a/tasks/BUGS.md b/tasks/BUGS.md
index 11e03f8..11bdce8 100644
--- a/tasks/BUGS.md
+++ b/tasks/BUGS.md
@@ -28,7 +28,7 @@
 - [x] S-03 ElyShow 的缩放一两帧后弹回“适合幻灯片”，缩放功能不可用 — 只在标签首次观察时适合一次；R1 PASS
 - [x] S-04 选屏对话框被别的对话框顶掉后，`show_starting` 卡住、放映副本泄漏 — 有对话框开着时不再顶掉它，提示先完成；选屏对话框被拒即丢副本；R2 PASS
 - [x] S-05 一条批注的时间恰为午夜或只有日期，整个批注栏不显示 — 读不出时间的批注只占一行汇总，其余照常显示（jiff 本可读只有日期的时间）；R2 PASS
-- [ ] S-06 导出或打印的“从–到”填 0 时导出全部幻灯片
+- [x] S-06 导出或打印的“从–到”填 0 时导出全部幻灯片 — 键入的页码夹到 1..=末页；R1 PASS
 - [ ] S-07 母版视图下演示检查的行按幻灯片序号跳转
 - [ ] S-08 刚编辑过幻灯片就进备注栏键入，备注可能丢
 - [ ] S-09 改尺寸失败后 `size_asked` 一直留着
diff --git a/tasks/reviews/S-06-r1.md b/tasks/reviews/S-06-r1.md
new file mode 100644
index 0000000..7ef22e9
--- /dev/null
+++ b/tasks/reviews/S-06-r1.md
@@ -0,0 +1 @@
+PASS