Update Host.md

Rhynorater · web-flow · commit 816d82a7b69a · 2018-09-27T18:56:27.000-04:00
diff --git a/Host.md b/Host.md
@@ -9,7 +9,7 @@ The `Host` object has the following attributes defined:
 * `domain` - MUST be the [second-level domain](https://en.wikipedia.org/wiki/Second-level_domain) for this `Host`
 * `company` - MUST be the company which owns this `Host` 
 * `dns` - MUST be the [`DNS`](DNS.md) object(s) that describe(s) this `Host`
-* `ports` - MUST be a map (key-value pair) with two keys: `tcp` and `udp`. These two keys MUST have values which are also maps (key-value pairs) which correlate a single number between 0-65535 (representing a port) to a [`Service`](Service.md) object (NOTE: Since JSON doesn't allow numbers to be keys, a string representation of the number must be used). If a port is closed, then it MUST NOT have an entry in the key-value pair under its respective `tcp` or `udp` designation. If a port is open, but no [`Service`](Service.md) object has been constructed, it should be left with a blank object `{}`. Otherwise, the port's value pair MUST point to its respective [`Service`](Service.md) object. 
+* `ports` - MUST be a map (key-value pair) with two keys: `tcp` and `udp`. These two keys MUST have values which are also maps (key-value pairs) which correlate a single number between 0-65535 (representing a port) to a [`Service`](Service.md) object (NOTE: Since JSON doesn't allow numbers to be keys, a string representation of the number must be used). If a port is closed, then it SHOULD NOT have an entry in the key-value pair under its respective `tcp` or `udp` designation. However, in the circumstance that data needs to be stored on a port that was open and is now closed, the [`Service`](Service.md) object's `active` attribute should be used to delimit that the port is closed. If a port is open, but no [`Service`](Service.md) object has been constructed, it should be left with a blank object `{}`. Otherwise, the port's value pair MUST point to its respective [`Service`](Service.md) object. 
 
 \* Required attributes  
 \*\* At least one of these attributes is required  
