diff --git a/docs/api/openapi.yaml b/docs/api/openapi.yaml
index 3665be677..9c384ba84 100644
--- a/docs/api/openapi.yaml
+++ b/docs/api/openapi.yaml
@@ -7792,8 +7792,9 @@ components:
                 type: string
               additionalProperties: {}
             - type: "null"
-          description: Metric-specific value object when status is 'ok' (e.g. { type, center, low, high, spread, sampleDays, k }
-            for VITALS_BASELINE); null when 'insufficient'.
+          description: Metric-specific value object when status is 'ok' (e.g. { type, center, low, high, spread, sampleDays, k,
+            series } for VITALS_BASELINE, where `series` is the trailing per-day mean values for the inline sparkline);
+            null when 'insufficient'.
         coverage:
           $ref: "#/components/schemas/DerivedCoverage"
         confidence: