diff --git a/esphome/components/api/__init__.py b/esphome/components/api/__init__.py
index d3001777c54..aabe708a9ec 100644
--- a/esphome/components/api/__init__.py
+++ b/esphome/components/api/__init__.py
@@ -301,6 +301,7 @@ CONFIG_SCHEMA = cv.All(
             # Maximum queued send buffers per connection before dropping connection
             # Each buffer uses ~8-12 bytes overhead plus actual message size
             # Platform defaults based on available RAM and typical message rates:
+            # CONF_MAX_SEND_QUEUE should be a power 2 for best performance
             cv.SplitDefault(
                 CONF_MAX_SEND_QUEUE,
                 esp8266=4,  # Limited RAM, need to fail fast