diff --git a/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_I2C.cpp b/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_I2C.cpp
index ab96be6471..fdc363a262 100644
--- a/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_I2C.cpp
+++ b/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_I2C.cpp
@@ -59,7 +59,7 @@ void AP_BattMonitor_SMBus_I2C::read()
 }
 
 // read word from register
-// returns true if read was succesful, false if failed
+// returns true if read was successful, false if failed
 bool AP_BattMonitor_SMBus_I2C::read_word(uint8_t reg, uint16_t& data) const
 {
     // get pointer to i2c bus semaphore