diff --git a/R/revenue.R b/R/revenue.R
index 6e9aa5f..c5d99b6 100644
--- a/R/revenue.R
+++ b/R/revenue.R
@@ -16,8 +16,9 @@
 #'   combined with other category names, and it is not the same thing as
 #'   `revenue_concept = "total"`: the concept chooses which subtypes are in
 #'   scope, `"All Categories"` chooses whether rows inside that scope are
-#'   broken out or summed. Combine with `subtype = "operations"` for an
-#'   own-source revenue total.
+#'   broken out or summed. Because the result keeps one row per
+#'   `revenue_subtype`, filtering the returned frame to
+#'   `revenue_subtype == "own_source"` gives an own-source revenue total.
 #' @param revenue_concept Which of Census's two published revenue concepts to
 #'   return. Concepts are defined as sets of the crosswalk's `revenue_subtype`
 #'   values -- never as item-code first letters, which cannot classify
diff --git a/R/spending.R b/R/spending.R
index 9086e64..c30fa26 100644
--- a/R/spending.R
+++ b/R/spending.R
@@ -78,8 +78,9 @@
 #'   combined with other category names, and it is not the same thing as
 #'   `expenditure_concept = "total"`: the concept chooses which subtypes are in
 #'   scope, `"All Categories"` chooses whether rows inside that scope are
-#'   broken out or summed. Combine with `subtype = "operations"` for an
-#'   operating-expenditure total.
+#'   broken out or summed. Because the result keeps one row per
+#'   `spend_subtype`, filtering the returned frame to
+#'   `spend_subtype == "operations"` gives an operating-expenditure total.
 #' @param per_capita If `TRUE`, adds `amt_per_capita_nominal` (and
 #'   `amt_per_capita_real` when `adjust_to_year` is set) using the per-year
 #'   Census F-33 population from `gov_population_yearly`. Result also gains
diff --git a/man/cog_revenue.Rd b/man/cog_revenue.Rd
index de677dd..ab978a1 100644
--- a/man/cog_revenue.Rd
+++ b/man/cog_revenue.Rd
@@ -29,8 +29,9 @@ category inside the requested concept's subtype scope. It cannot be
 combined with other category names, and it is not the same thing as
 `revenue_concept = "total"`: the concept chooses which subtypes are in
 scope, `"All Categories"` chooses whether rows inside that scope are
-broken out or summed. Combine with `subtype = "operations"` for an
-own-source revenue total.}
+broken out or summed. Because the result keeps one row per
+`revenue_subtype`, filtering the returned frame to
+`revenue_subtype == "own_source"` gives an own-source revenue total.}
 
 \item{per_capita}{If `TRUE`, adds `amt_per_capita_nominal` (and
 `amt_per_capita_real` when `adjust_to_year` is set) using the per-year
diff --git a/man/cog_spending.Rd b/man/cog_spending.Rd
index e0dedd2..1fee7d1 100644
--- a/man/cog_spending.Rd
+++ b/man/cog_spending.Rd
@@ -29,8 +29,9 @@ category inside the requested concept's subtype scope. It cannot be
 combined with other category names, and it is not the same thing as
 `expenditure_concept = "total"`: the concept chooses which subtypes are in
 scope, `"All Categories"` chooses whether rows inside that scope are
-broken out or summed. Combine with `subtype = "operations"` for an
-operating-expenditure total.}
+broken out or summed. Because the result keeps one row per
+`spend_subtype`, filtering the returned frame to
+`spend_subtype == "operations"` gives an operating-expenditure total.}
 
 \item{per_capita}{If `TRUE`, adds `amt_per_capita_nominal` (and
 `amt_per_capita_real` when `adjust_to_year` is set) using the per-year