diff --git a/esphome/components/ota/ota_backend_esp8266.h b/esphome/components/ota/ota_backend_esp8266.h
index d3668d4d10..8580e5b52b 100644
--- a/esphome/components/ota/ota_backend_esp8266.h
+++ b/esphome/components/ota/ota_backend_esp8266.h
@@ -19,6 +19,7 @@ class ESP8266OTABackend : public OTABackend {
   OTAResponseTypes write(uint8_t *data, size_t len) override;
   OTAResponseTypes end() override;
   void abort() override;
+  // Compression supported in all ESP8266 Arduino versions ESPHome supports (>= 2.7.0)
   bool supports_compression() override { return true; }
 
  protected: