diff --git a/GROUPS.md b/GROUPS.md
index 860dcfb1..fdca9d37 100644
--- a/GROUPS.md
+++ b/GROUPS.md
@@ -182,6 +182,10 @@ These groups are used mostly for informational purposes
 * `redstone_torch=1`: Redstone Torch (lit)
 * `redstone_torch=2`: Redstone Torch (unlit)
 
+* `dirt=1`: Uncovered dirt
+* `dirt=2`: Covered dirt (grass or mycelium or podzol on top)
+* `dirt=3`: Coarse dirt
+
 * `plant=1`: Plant or part of a plant
 * `double_plant`: Part of a double-sized plant. 1 = lower part, 2 = upper part