diff --git a/README_RGB.md b/README_RGB.md
index 452c895..08c6ec7 100644
--- a/README_RGB.md
+++ b/README_RGB.md
@@ -19,7 +19,7 @@ The data includes RGB and fluorescence images of plants along with derived morph
 
 Individual files (interim data products) are located under subdirectories. Filenames follow a specific format that encodes information about the data:
 
-VIS_<Data Type>_<POT_BARCODE>_<Time_In>_<RGB_or_Flurescence>-<View>-<Angle>-<Image_Product_Type>_<Experiment_Number>_<Treatment>_<Time_Out>.png
+VIS_<Data Type>_<POT_BARCODE>_<Time_In>_<RGB_or_Flurescence>-<View>-<Angle>-<Image_Product_Type>_<Experiment_Number>_<Treatment>_<Time_Out>.{png or csv}
 
 - VIS: Prefix indicating data from the visible light imaging chamber
 - <Data Type>: