diff --git a/esphome/components/web_server/web_server.h b/esphome/components/web_server/web_server.h
index c80cce2e2c..c7c0488a15 100644
--- a/esphome/components/web_server/web_server.h
+++ b/esphome/components/web_server/web_server.h
@@ -107,7 +107,9 @@ struct UrlMatch {
     return method && method_len == strlen(str) && memcmp(method, str, method_len) == 0;
   }
 
-  /// Check if method is empty or "state" (for sub-device GET requests)
+  /// Check if method is empty or "state" (for backward compatibility with old frontends)
+  /// Old frontends send /{domain}/{entity}/state for GET requests, so "state" is treated as no action.
+  /// This is safe because no ESPHome entity type has a "state" action - actions are like "turn_on", "toggle", etc.
   bool method_empty() const { return method_len == 0 || this->method_equals("state"); }
 };