Add table of instrument additive property (open-telemetry#2906)

specification/metrics/supplementary-guidelines.md

@@ -112,9 +112,18 @@ middle. Here are some examples:
   to add up the voltage values anymore.
 
 In OpenTelemetry, each [Instrument](./api.md#instrument) implies whether it is
-additive or not. For example, [Counter](./api.md#counter) and
-[UpDownCounter](./api.md#updowncounter) are additive while [Asynchronous
-Gauge](./api.md#asynchronous-gauge) is non-additive.
+additive or not.
+
+| Instrument                                                        | Additive          |
+| ----------------------------------------------------------------- | ----------------- |
+| [Counter](./api.md#counter)                                       | additive          |
+| [UpDownCounter](./api.md#updowncounter)                           | additive          |
+| [Histogram](./api.md#histogram)                                   | mixed<sup>1</sup> |
+| [Asynchronous Gauge](./api.md#asynchronous-gauge)                 | non-additive      |
+| [Asynchronous Counter](./api.md#asynchronous-counter)             | additive          |
+| [Asynchronous UpDownCounter](./api.md#asynchronous-updowncounter) | additive          |
+
+1: The Histogram bucket counts are additive if the buckets are the same, the sum is additive, but the min and max are non-additive.
 
 #### Numeric type selection