diff --git a/README_RGB.md b/README_RGB.md
index 1c9257a..9da87f8 100644
--- a/README_RGB.md
+++ b/README_RGB.md
@@ -84,15 +84,15 @@ The spreadsheets contains various phenotypic measurements derived from the RGB i
 - `Angle`
     - Side view angle where the vegetation is most dispersed
 - `Width`, `Height`
-    - Dimensions of the green box in the corresponding MES file
+    - Dimensions of the green box in the corresponding "MES" file
 - `Surface`
     - Area of the vegetation measured by the red polygon (Section 2)
 - `Convex hull`
     - Area of the convex hull measured by the blue polygon
 - `Roundedness`
-    - Roundness of the red polygon (calculation method unclear)
+    - Roundness of the red polygon (❗ calculation method unclear)
 - `Center_of_mass_distance`
-    - Unclear meaning
+    - ❗ Unclear meaning
 - `Center_of_mass_x`, `Center_of_mass_y`
     - Coordinates of the center of mass point 
 - `Hue, Saturation`, `Intensity`