Update comm.md

Sometimes you just get carried away when you see how uninformative something is.

Author: Colin Robertson

docs/assembler/masm/comm.md

@@ -1,7 +1,7 @@
 ---
 title: "COMM | Microsoft Docs"
 ms.custom: ""
-ms.date: "11/04/2016"
+ms.date: "05/22/2018"
 ms.technology: ["cpp-masm"]
 ms.topic: "reference"
 f1_keywords: ["COMM"]
@@ -13,21 +13,31 @@ ms.author: "corob"
 ms.workload: ["cplusplus"]
 ---
 # COMM
-Creates a communal variable with the attributes specified in `definition`.  
-  
-## Syntax  
-  
-```  
-  
-COMM definition [[, definition]] ...  
-```  
-  
-## Remarks  
- Each `definition` has the following form:  
-  
- [[*langtype*]] [[**NEAR** | **FAR**]] *label* **:** `type`[[**:** *count*]]  
-  
- The *label* is the name of the variable. The `type` can be any type specifier ([BYTE](../../assembler/masm/byte-masm.md), [WORD](../../assembler/masm/word.md), and so on) or an integer specifying the number of bytes. The *count* specifies the number of data objects (one is the default).  
-  
-## See Also  
- [Directives Reference](../../assembler/masm/directives-reference.md)
+
+Creates a communal variable with the attributes specified in *definition*.
+
+## Syntax
+
+> **COMM** *definition* [, *definition*] ...
+
+## Remarks
+
+Communal variables are allocated by the linker, and can't be initialized. This means that you can't depend on the location or sequence of such variables.
+
+Each *definition* has the following form:
+
+[*langtype*] [**NEAR** | **FAR**] _label_**:**_type_[**:**_count_]
+
+The optional *langtype* sets the naming conventions for the name that follows. It overrides any language specified by the **.MODEL** directive. The optional **NEAR** or **FAR** override the current memory model. The *label* is the name of the variable. The *type* can be any type specifier ([BYTE](../../assembler/masm/byte-masm.md), [WORD](../../assembler/masm/word.md), and so on) or an integer specifying the number of bytes. The optional *count* specifies the number of elements in the declared data object; the default is one.
+
+## Example
+
+This example creates an array of 512 BYTE elements:
+
+```masm
+COMM FAR ByteArray:BYTE:512
+```
+
+## See also
+
+[Directives Reference](../../assembler/masm/directives-reference.md)