diff --git a/CHANGELOG.md b/CHANGELOG.md
index 813bc5fb20..01e0081265 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 
 ## Unreleased
 
+- Report focus change https://terminalguide.namepad.de/mode/p1004/.
 - Updated wgpu to 0.19.0.
 - Removed support to DX11.
 - Add basic touch support by @androw [#226](https://github.com/raphamorim/rio/pull/226)
diff --git a/frontends/rioterm/src/screen/mod.rs b/frontends/rioterm/src/screen/mod.rs
index 3506d99424..1b67c63cd1 100644
--- a/frontends/rioterm/src/screen/mod.rs
+++ b/frontends/rioterm/src/screen/mod.rs
@@ -1352,6 +1352,19 @@ impl Screen {
         self.ctx_mut().current_mut().messenger.send_bytes(msg);
     }
 
+    #[inline]
+    pub fn on_focus_change(&mut self, is_focused: bool) {
+        if self.get_mode().contains(Mode::FOCUS_IN_OUT) {
+            let chr = if is_focused { "I" } else { "O" };
+
+            let msg = format!("\x1b[{}", chr);
+            self.ctx_mut()
+                .current_mut()
+                .messenger
+                .send_bytes(msg.into_bytes());
+        }
+    }
+
     #[inline]
     pub fn scroll(&mut self, new_scroll_x_px: f64, new_scroll_y_px: f64) {
         let width = self.sugarloaf.layout.scaled_sugarwidth as f64;
diff --git a/frontends/rioterm/src/sequencer.rs b/frontends/rioterm/src/sequencer.rs
index 7af1791ae3..2f2c319820 100644
--- a/frontends/rioterm/src/sequencer.rs
+++ b/frontends/rioterm/src/sequencer.rs
@@ -922,6 +922,8 @@ impl Sequencer {
                         if has_regained_focus {
                             route.redraw();
                         }
+
+                        route.window.screen.on_focus_change(focused);
                     }
                 }