diff --git a/esphome/components/esphome/ota/ota_esphome.cpp b/esphome/components/esphome/ota/ota_esphome.cpp
index a3d8897969..f640c0113b 100644
--- a/esphome/components/esphome/ota/ota_esphome.cpp
+++ b/esphome/components/esphome/ota/ota_esphome.cpp
@@ -189,7 +189,9 @@ static constexpr uint8_t CLIENT_NOISE_FEATURES =
 static constexpr uint8_t SERVER_FEATURE_SUPPORTS_COMPRESSION = 0x01;
 static constexpr uint8_t SERVER_FEATURE_SUPPORTS_PARTITION_ACCESS = 0x02;
 static constexpr uint8_t SERVER_FEATURE_SUPPORTS_NOISE = 0x04;
-// The device inflates a raw deflate stream (window <= OTA_INFLATE_WINDOW_SIZE)
+// The device inflates a raw deflate stream (window <= OTA_INFLATE_WINDOW_SIZE).
+// The offer is binding: a client that asked for it must then send the inflated
+// size frame and a deflate stream, the device does not check again.
 static constexpr uint8_t SERVER_FEATURE_SUPPORTS_DEFLATE = 0x08;
 
 inline bool ESPHomeOTAComponent::extended_proto_() const {
diff --git a/esphome/espota2.py b/esphome/espota2.py
index 36a9b76659..d9b09ef534 100644
--- a/esphome/espota2.py
+++ b/esphome/espota2.py
@@ -70,6 +70,8 @@ CLIENT_FEATURE_SUPPORTS_DEFLATE = 0x10
 SERVER_FEATURE_SUPPORTS_COMPRESSION = 0x01
 SERVER_FEATURE_SUPPORTS_PARTITION_ACCESS = 0x02
 SERVER_FEATURE_SUPPORTS_NOISE = 0x04
+# Binding once offered: the device then expects the image size frame and a
+# deflate stream, so there is no opting out per upload
 SERVER_FEATURE_SUPPORTS_DEFLATE = 0x08
 
 # Window of the raw deflate stream sent to a device that inflates on the fly.