diff --git a/examples/ONE_V9/ONE_V9.ino b/examples/ONE_V9/ONE_V9.ino
index 238bc02..55a6b21 100644
--- a/examples/ONE_V9/ONE_V9.ino
+++ b/examples/ONE_V9/ONE_V9.ino
@@ -78,7 +78,7 @@ S8_sensor sensor;
 // time in seconds needed for NOx conditioning
 uint16_t conditioning_s = 10;
 
-// for peristent saving and loading
+// for persistent saving and loading
 int addr = 4;
 byte value;