diff --git a/esphome/components/ota/ota_backend_esp8266.cpp b/esphome/components/ota/ota_backend_esp8266.cpp
index fe829ab0629..51a3f99da86 100644
--- a/esphome/components/ota/ota_backend_esp8266.cpp
+++ b/esphome/components/ota/ota_backend_esp8266.cpp
@@ -223,7 +223,7 @@ bool ESP8266OTABackend::write_buffer_() {
 }
 
 bool ESP8266OTABackend::write_buffer_final_() {
-  // Same as write_buffer_() but without MD5 update (for final padded write)
+  // Similar to write_buffer_(), but without flash mode patching or MD5 update (for final padded write)
   if (this->buffer_len_ == 0) {
     return true;
   }
@@ -334,9 +334,9 @@ bool ESP8266OTABackend::verify_end_() {
     return false;
   }
 
-// Check if new firmware's flash size fits (only when auto-detection is disabled)
-// With FLASH_MAP_SUPPORT (modern cores), flash size is auto-detected from chip
 #if !FLASH_MAP_SUPPORT
+  // Check if new firmware's flash size fits (only when auto-detection is disabled)
+  // With FLASH_MAP_SUPPORT (modern cores), flash size is auto-detected from chip
   // NOLINTNEXTLINE(readability-static-accessed-through-instance)
   uint32_t bin_flash_size = ESP.magicFlashChipSize((bytes[3] & 0xf0) >> 4);
   // NOLINTNEXTLINE(readability-static-accessed-through-instance)
diff --git a/esphome/components/ota/ota_backend_esp8266.h b/esphome/components/ota/ota_backend_esp8266.h
index d3668d4d109..a9d6dd2ccc5 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:
@@ -49,7 +50,7 @@ class ESP8266OTABackend : public OTABackend {
   size_t image_size_{0};
 
   md5::MD5Digest md5_{};
-  uint8_t expected_md5_[16];  // MD5 = 16 bytes
+  uint8_t expected_md5_[16];  // Fixed-size buffer for 128-bit (16-byte) MD5 digest
   bool md5_set_{false};
 };