diff --git a/esphome/components/pylontech/pylontech.cpp b/esphome/components/pylontech/pylontech.cpp
index d724253256..da44c6cb0e 100644
--- a/esphome/components/pylontech/pylontech.cpp
+++ b/esphome/components/pylontech/pylontech.cpp
@@ -56,6 +56,8 @@ void PylontechComponent::setup() {
 void PylontechComponent::update() { this->write_str("pwr\n"); }
 
 void PylontechComponent::loop() {
+  // Early return avoids stack adjustment for the batch buffer below.
+  // loop() runs ~7000/min so most calls have nothing to read.
   int avail = this->available();
   if (avail > 0) {
     // pylontech sends a lot of data very suddenly