diff --git a/README_RGB.md b/README_RGB.md
index ec1688e..f3f7ef1 100644
--- a/README_RGB.md
+++ b/README_RGB.md
@@ -105,7 +105,8 @@ The spreadsheets contains various phenotypic measurements derived from the RGB i
 - `Fluorescence`
     - Average fluorescence intensity
 - `H###`, `S##`, `V##`
-    - Frequency of pixels with specific hue (###: 0-359), saturation (##: 0-99), and intensity (##: 0-99) values
+    - Frequency of pixels with specific hue (###: 0-359), saturation (##: 0-99), and value (##: 0-99)
+    - Check the definitions of hue, saturation, and value in [this link](https://changingminds.org/explanations/perception/visual/hsl.htm)
 - `F##`
     - Frequency of pixels with a specific fluorescence value (##: 0-99)
 - `View`