diff --git a/build/build_rolling.sql b/build/build_rolling.sql
index 71a7d84..27f7e44 100644
--- a/build/build_rolling.sql
+++ b/build/build_rolling.sql
@@ -1,10 +1,7 @@
 /*
-baseline        - selections from actual, plan, and forecast
-incr            - increment selection from baseline
-incoming        - baseline & incr stacked
-negative        - apply negative values to existing baseline to create a diff
-diff            - stack incoming and the negative
-collapse_diff   - group the diff to create single diff rows per item
+establish an existing forecast to operate on top of
+update to refrect actuals with a diff as an iteration
+create and additional to remove pull-forward as actuals flow in
 */
 
 
@@ -21,9 +18,9 @@ CREATE TEMP TABLE tdr AS (
         -----------actuals into baseline-------------------------------------
          DATERANGE('2020-06-01','2021-07-07','[]') arange
         -----------plan into baseline----------------------------------------
-        ,DATERANGE('2021-07-08','2022-06-01','[)') prange
+        ,DATERANGE('2021-06-01','2022-06-01','[)') prange
         -----------forecast into baseline------------------------------------
-        ,DATERANGE('2022-06-01','2022-06-01','[)') frange
+        ,DATERANGE('2022-06-01','2022-06-01','[)') frange   -- this range effectively excludes
         -----------baseline selection for increment--------------------------
         ,DATERANGE('2021-07-08','2021-07-08','[)') selection
         -----------selection increment size----------------------------------