diff --git a/esphome/components/deep_sleep/deep_sleep_component.h b/esphome/components/deep_sleep/deep_sleep_component.h
index d35d1538b6..15f901df86 100644
--- a/esphome/components/deep_sleep/deep_sleep_component.h
+++ b/esphome/components/deep_sleep/deep_sleep_component.h
@@ -48,7 +48,7 @@ struct WakeupCauseToRunDuration {
   uint32_t touch_cause;
   // Run duration if woken up by GPIO pins.
   uint32_t gpio_cause;
-  // Run duration if woken up by ext1 pins.
+  // Run duration if woken up by EXT1 pins.
   uint32_t ext1_cause;
 };