diff --git a/taxcalc/records_variables.json b/taxcalc/records_variables.json
index d6ea9825e..946286b6b 100644
--- a/taxcalc/records_variables.json
+++ b/taxcalc/records_variables.json
@@ -511,7 +511,7 @@
     },
     "n24": {
       "type": "int",
-      "desc": "Number of children eligible for Child Tax Credit",
+      "desc": "Number of children under age 17 eligible for Child Tax Credit",
       "form": {"2013-2016": "imputed from CPS data"},
       "availability": "taxdata_puf, taxdata_cps"
     },