diff --git a/MaterialCodes.txt b/MaterialCodes.txt
index 637d80c..19208af 100644
--- a/MaterialCodes.txt
+++ b/MaterialCodes.txt
@@ -68,12 +68,14 @@ Caution! Identifier 100 ist for variable soil moisture (from GUI)
 236 = Graphite (2.2 g/cm^3)
 237 = Lead (11.342 g/cm^3)
 238 = TNT (1.654 g/cm^3)
+239 = Plants (like 21)
 240 = Snow (new) (0.03 g/cm^3)
 241 = Snow (new, wet) (0.1 g/cm^3)
 242 = Snow (old, dry) (0.3 g/cm^3)
 243 = Snow (old, wet) (0.5 g/cm^3)
 244 = Ice (0.85 g/cm^3)
 247 = Salt Water (3.5 g/m^3)
+248 = Wood (variable)
 254 = Water (1 g/cm^3)