From 31a77f520a1e92486e932564804ef627f1dfc0c7 Mon Sep 17 00:00:00 2001
From: Thomas Neirynck <thomas@elastic.co>
Date: Tue, 15 Sep 2020 09:18:38 -0400
Subject: [PATCH] add clarifying comment

---
 .../styles/vector/properties/dynamic_style_property.tsx        | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/x-pack/plugins/maps/public/classes/styles/vector/properties/dynamic_style_property.tsx b/x-pack/plugins/maps/public/classes/styles/vector/properties/dynamic_style_property.tsx
index b1d00d36cd446..ba5cc9e8c130b 100644
--- a/x-pack/plugins/maps/public/classes/styles/vector/properties/dynamic_style_property.tsx
+++ b/x-pack/plugins/maps/public/classes/styles/vector/properties/dynamic_style_property.tsx
@@ -382,6 +382,9 @@ export class DynamicStyleProperty<T>
   }
 
   getMbPropertyValue(rawValue: RawValue): RawValue {
+    // Maps only uses feature-state for numerical values.
+    // `supportsMbFeatureState` will only return true when the mb-style rule does a feature-state lookup on a numerical value
+    // Calling `isOrdinal` would be equivalent.
     return this.supportsMbFeatureState() ? getNumericalMbFeatureStateValue(rawValue) : rawValue;
   }
 }