diff --git a/DataGuide_AAPF_RGB.md b/DataGuide_AAPF_RGB.md
index 355cf05..adf625f 100644
--- a/DataGuide_AAPF_RGB.md
+++ b/DataGuide_AAPF_RGB.md
@@ -83,7 +83,7 @@ These image files visually represent morphological measurements on the vegetatio
 
 
 
-### How to Read Information in spreadsheet files (.xlsx for master file, csv file for individual measurements)
+### How to Read Information in spreadsheet files (.xlsx for master file or csv file for individual measurements)
 
 The spreadsheets contains various phenotypic measurements derived from the RGB images. Here's a breakdown of the column headers: