diff --git a/README.md b/README.md
index 6c8c69e..fcb5b66 100644
--- a/README.md
+++ b/README.md
@@ -90,6 +90,17 @@ void loop() {
 }
 ```
 
+If you cannot get values by calling magUpdate, try calling beginMag and magUpdate again.
+```c
+void loop() {
+  auto result = mySensor.magUpdate();
+  if (result != 0) {
+    mySensor.beginMag();
+    result = mySensor.magUpdate();
+  }
+}
+```
+
 If you get values of sensor like this..
 
 Name | Max | Min
diff --git a/examples/GetData/GetData.ino b/examples/GetData/GetData.ino
index d54bc32..468ce06 100644
--- a/examples/GetData/GetData.ino
+++ b/examples/GetData/GetData.ino
@@ -66,6 +66,11 @@ void loop() {
   }
 
   result = mySensor.magUpdate();
+  if (result != 0) {
+    Serial.println("cannot read mag so call begin again");
+    mySensor.beginMag();
+    result = mySensor.magUpdate();
+  }
   if (result == 0) {
     mX = mySensor.magX();
     mY = mySensor.magY();