diff --git a/docs/api/DLUHC-CORE-Data.v1.json b/docs/api/DLUHC-CORE-Data.v1.json
index 015e98a07..7600c71c5 100644
--- a/docs/api/DLUHC-CORE-Data.v1.json
+++ b/docs/api/DLUHC-CORE-Data.v1.json
@@ -901,7 +901,13 @@
           },
           "net_income_uc_proportion": {
             "type": "string",
-            "minLength": 1
+            "minLength": 1,
+            "enum": [
+              "All",
+              "Some",
+              "None",
+              "Do not know"
+            ]
           },
           "housing_benefit": {
             "type": "string",
@@ -1158,4 +1164,4 @@
     },
     "securitySchemes": {}
   }
-}
+}
\ No newline at end of file