diff --git a/api/src/services/text_processing/normalizer.py b/api/src/services/text_processing/normalizer.py
index 11f5ad7..e743ad1 100644
--- a/api/src/services/text_processing/normalizer.py
+++ b/api/src/services/text_processing/normalizer.py
@@ -55,6 +55,7 @@ VALID_TLDS = [
     "uk",
     "us",
     "io",
+    "co",
 ]
 
 VALID_UNITS = {