diff --git a/esphome/components/api/api_connection.cpp b/esphome/components/api/api_connection.cpp
index c8600048f7..c8e6480e1e 100644
--- a/esphome/components/api/api_connection.cpp
+++ b/esphome/components/api/api_connection.cpp
@@ -289,7 +289,7 @@ uint16_t APIConnection::encode_message_to_buffer(ProtoMessage &msg, uint8_t mess
     return 0;  // Doesn't fit
   }
 
-  // Get buffer and prepare it inline
+  // Get buffer size after allocation (which includes header padding)
   std::vector<uint8_t> &shared_buf = conn->parent_->get_shared_buffer_ref();
   size_t size_before_encode = shared_buf.size();