diff --git a/pipeline/transform/models/staging/stg_ees_ks2_national.sql b/pipeline/transform/models/staging/stg_ees_ks2_national.sql
index 7335ce6..44dfbe4 100644
--- a/pipeline/transform/models/staging/stg_ees_ks2_national.sql
+++ b/pipeline/transform/models/staging/stg_ees_ks2_national.sql
@@ -31,4 +31,10 @@ select
 
 from {{ source('raw', 'ees_ks2_national') }}
 where time_period ~ '^[0-9]+$'
-  and cast(trim(time_period) as integer) >= 201617
+  -- 2015/16 was the first year of the current expected-standard tests, so it's
+  -- the correct floor (not 2016/17 -- that excluded a real, comparable national
+  -- row). GPS/science/scaled-score columns are already mapped correctly end to
+  -- end (tap.py's _KS2_NATIONAL_COL_MAP + this model select them fine); the
+  -- prod NULLs for those fields are stale raw.ees_ks2_national data from before
+  -- the map covered them, not a mapping bug -- no map change accompanies this fix.
+  and cast(trim(time_period) as integer) >= 201516