diff --git a/ordr3/models.py b/ordr3/models.py
index 0e462c0..b20dd7a 100644
--- a/ordr3/models.py
+++ b/ordr3/models.py
@@ -20,6 +20,7 @@ class OrderCategory(enum.Enum):
     SOLVENT = 2
     CHEMICAL = 3
     BIOLAB = 4
+    SYNTHESIS = 5
 
 
 @enum.unique