Update voice.md

docs/features/voice.md

@@ -1,12 +1,13 @@
 # Feature: voice
 
-Datatype: `string`
+Feature group |Feature type | Data type | Available for node types
+---  | --- | --- | ---
+[`Morphological`](featuresbygroup.md#morphological-features) | [`Node`](featuresbyfeaturetype.md#node-features) | `String`  | [`word`](featuresbynodetype.md#word-nodes)
 
-Available for nodetype(s): [`word`](wordnodefeatures.md#readme)
+## Feature description
+Gramatical voice of the verb.
 
-Feature description: Gramatical voice of the verb.
-
-Possible values (curent): 
+## Feature values
 
 voice (this feature) | explanation | Frequency
 --- | --- | ---
@@ -16,9 +17,13 @@ MiddlePassive | | 1714
 Passive | The subject of the verb is being acted upon | 3493
 '' | Empty for wordtypes other than verbs | 109422
 
-Planned for future version: active, middle, passive, middle_or_passive, middle_deponent, passive_deponent, middle_or_passive_deponent, impersonal_active, and no_voice. Possibly by just adding a feature 'deponent'?
+## Notes
+
+Planned for future version? active, middle, passive, middle_or_passive, middle_deponent, passive_deponent, middle_or_passive_deponent, impersonal_active, and no_voice. Possibly by just adding a feature 'deponent'?
+
+## Source description
 
-Note: This needs further evaluation.
+Taken from XML attribute `voice` of tag `w` (word).
 
 ---
 ###### [Click here for list of all features](home.md#readme)