diff --git a/website/docs/docs/build/unit-tests.md b/website/docs/docs/build/unit-tests.md
index 7156ff3bc48..9b0c4b83575 100644
--- a/website/docs/docs/build/unit-tests.md
+++ b/website/docs/docs/build/unit-tests.md
@@ -22,8 +22,9 @@ Now, we are introducing a new type of test to dbt - unit tests. In software prog
 ## Before you begin
 
 - We currently only support unit testing SQL models.
-- We currently don't support unit testing models that use recursive SQL. 
 - We currently only support adding unit tests to models in your _current_ project.
+- We currently *don't* support unit testing models that use recursive SQL.
+- You must specify all fields in a BigQuery STRUCT in a unit test. You cannot use only a subset of fields in a STRUCT.
 - If your model has multiple versions, by default the unit test will run on *all* versions of your model. Read [unit testing versioned models](#unit-testing-versioned-models) for more information.
 - Unit tests must be defined in a YML file in your `models/` directory.
 
diff --git a/website/docs/reference/resource-properties/data-types.md b/website/docs/reference/resource-properties/data-types.md
index 1adc4e3f502..6cea501208d 100644
--- a/website/docs/reference/resource-properties/data-types.md
+++ b/website/docs/reference/resource-properties/data-types.md
@@ -64,6 +64,9 @@ unit_tests:
            struct_field: 'struct("Isha" as name, 22 as age)'
            struct_of_struct_field: 'struct(struct(1 as id, "blue" as color) as my_struct)'
            struct_array_field: ['struct(st_geogpoint(75, 45) as my_point)', 'struct(st_geogpoint(75, 35) as my_point)']
+           # Make sure to include all the fields in a BigQuery `struct` within the unit test.
+           # It's not currently possible to use only a subset of columns in a 'struct'
+
 
 ```