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-rw-r--r--requirements/data_models/dml-pipe.md10
1 files changed, 9 insertions, 1 deletions
diff --git a/requirements/data_models/dml-pipe.md b/requirements/data_models/dml-pipe.md
index a701ea3..d889b0a 100644
--- a/requirements/data_models/dml-pipe.md
+++ b/requirements/data_models/dml-pipe.md
@@ -10,4 +10,12 @@ bucket. In other words, it represents a flow of money from the tank to a bucket.
| period | string | How long it takes for `amount` to flow through the pipe. |
| bucket_id | string | The ID of the bucket to which this pipe corresponds. |
-Source: req-017
+Constraints:
+
+- `period` must be one of these options:
+ - `day`
+ - `week`
+ - `month`
+ - `year`
+
+Sources: req-017, req-037