diff --git a/local_astrid/MVCAA_Tutorial_4.Rmd b/local_astrid/MVCAA_Tutorial_4.Rmd
index b5f25c0a..5fa968c9 100644
--- a/local_astrid/MVCAA_Tutorial_4.Rmd
+++ b/local_astrid/MVCAA_Tutorial_4.Rmd
@@ -16,7 +16,7 @@ knitr::opts_chunk$set(fig.width = 7, fig.height = 5)
 ## Introduction
 
 This tutorial demonstrates how to analyze 'airsensor' data using functions
-tailored to that data type, all of which have names beginning with `airsensor_`. 
+tailored to that data type, all of which have names beginning with `sensor_`. 
 In order to run the code in this tutorial you must have 
 followed the instructions in Tutorials 1-3 and created a directory with 'pas', 
 'pat', and 'airsensor' data files for the Methow Valley. Target audiences