diff --git a/examples/demo/demo.ino b/examples/demo/demo.ino
index a7d962e..063706e 100644
--- a/examples/demo/demo.ino
+++ b/examples/demo/demo.ino
@@ -53,8 +53,14 @@ void setup() {
 void loop() {
     delay(2000);
 
+    // we suggest you to use `print + "\n"` instead of `println`
+    // because the println will send "\n" separately, which means
+    // it will cost a sending buffer just for storage "\n". (there
+    // only 8 buffer space in ESPAsyncWebServer by default)
     WebSerial.print(F("IP address: "));
-    WebSerial.println(WiFi.localIP());
+    // if not use toString the ip will be sent in 7 part,
+    // which means it will cost 7 sending buffer.
+    WebSerial.println(WiFi.localIP().toString());
     WebSerial.printf("Millis=%lu\n", millis());
     WebSerial.printf("Free heap=[%u]\n", ESP.getFreeHeap());
 }
\ No newline at end of file
diff --git a/examples/demo_ap/demo_ap.ino b/examples/demo_ap/demo_ap.ino
index 507895a..a8c42f9 100644
--- a/examples/demo_ap/demo_ap.ino
+++ b/examples/demo_ap/demo_ap.ino
@@ -50,8 +50,14 @@ void setup() {
 void loop() {
     delay(2000);
 
+    // we suggest you to use `print + "\n"` instead of `println`
+    // because the println will send "\n" separately, which means
+    // it will cost a sending buffer just for storage "\n". (there
+    // only 8 buffer space in ESPAsyncWebServer by default)
     WebSerial.print(F("IP address: "));
-    WebSerial.println(WiFi.localIP());
+    // if not use toString the ip will be sent in 7 part,
+    // which means it will cost 7 sending buffer.
+    WebSerial.println(WiFi.localIP().toString());
     WebSerial.printf("Millis=%lu\n", millis());
     WebSerial.printf("Free heap=[%u]\n", ESP.getFreeHeap());
 }
\ No newline at end of file