diff --git a/examples/editor-libcosmic/src/main.rs b/examples/editor-libcosmic/src/main.rs
index c3abaef..4222359 100644
--- a/examples/editor-libcosmic/src/main.rs
+++ b/examples/editor-libcosmic/src/main.rs
@@ -334,9 +334,9 @@ fn update_alignment<'a, T: Edit<'a>>(editor: &mut T, align: Align) {
             std::cmp::Ordering::Equal => (current_line, current_line),
         };
         for line in editor.buffer_mut().lines[start..=end].iter_mut() {
-            line.set_align(align);
+            line.set_align(Some(align));
         }
     } else if let Some(line) = editor.buffer_mut().lines.get_mut(current_line) {
-        line.set_align(align);
+        line.set_align(Some(align));
     }
 }
diff --git a/src/buffer_line.rs b/src/buffer_line.rs
index 57acdac..c1f5b92 100644
--- a/src/buffer_line.rs
+++ b/src/buffer_line.rs
@@ -104,10 +104,11 @@ impl BufferLine {
     /// Set the text alignment
     ///
     /// Will reset shape and layout if it differs from current alignment.
+    /// Setting to None will use `Align::Right` for RTL lines, and `Align::Left` for LTR lines.
     /// Returns true if the line was reset
-    pub fn set_align(&mut self, align: Align) -> bool {
-        if Some(align) != self.align {
-            self.align = Some(align);
+    pub fn set_align(&mut self, align: Option<Align>) -> bool {
+        if align != self.align {
+            self.align = align;
             self.reset_layout();
             true
         } else {