diff --git a/DataGuide_AAPF_HSI.md b/DataGuide_AAPF_HSI.md
index 21be4b0..8f6a0e5 100644
--- a/DataGuide_AAPF_HSI.md
+++ b/DataGuide_AAPF_HSI.md
@@ -100,9 +100,15 @@ The spreadsheets contains various phenotypic measurements derived from the HSI d
     - Scan start date
 - `DFP`
     - Age of plant in days from planting at time of imaging
-- `{vegetation index}_{statistic}`
-    - Statistics of vegetation indices over vegetation mask area. See below for more detail.
-- `Wavelength in nm`
+- `{vegetation index}_{statistic} (e.g., NDVI_avg)`
+    - Statistics of vegetation indices over vegetation mask area. 
+    - List of statistics used
+        - avg: average
+        - sd: standard deviation
+        - max: maximum
+        - min: minimum
+        - p##: ##-th percentile). 
+- `Wavelength in nm (e.g., 402.8)`
     - Average reflectance over vegetation mask area (ratio of reflected energy to incident energy)