ExecuteSQL Using Variable Expression And Comments

I have been successful using comments (to help remind me that the SQL is coming from a varaible which is set via an expresion) within the variable expression passed to a Source or Destination. I have been unable to get this to work in an ExecuteSQL control flow task when parameters are used within the query. I am not sure what is causing this not to work the fact that it is an ExecuteSQL control flow task or that the SQL has parameters (or perhaps that it also uses an OUTPUT parameter).

Any thoughts to share? Am I missing something?

WORKS (In Data Flow SQL):
"--NOTE: This is defined by an expression on Source_AdventureWorks_Customers_SQL variable
SELECT
[CustomerID],
[TerritoryID],
[AccountNumber],
[CustomerType],
[rowguid],
[ModifiedDate]
FROM
[AdventureWorks].[Sales].[Customer]"

FAILS (in Control Flow ExecuteSQL with parms including Output parm):
"--NOTE: This is defined by an expression on Source_AdventureWorks_Customers_SQL variable
[audit].[up_LogEtlPackageStart]
@ETLAuditParentKey = ?,
@Description = ?,
@PackageName = ?,
@PackageGuid = ?,
@PackageVersionMajor = ?,
@PackageVersionMinor = ?,
@PackageVersionBuild = ?,
@MachineName = ?,
@ExecutionGuid = ?,
@LogicalDate = ?,
@StartTime = ?,
@Operator = ?,
@ETLAuditKey = ? OUTPUT"

WORKS (in Control Flow ExecuteSQL with parms including Output parm):
"[audit].[up_LogEtlPackageStart]
@ETLAuditParentKey = ?,
@Description = ?,
@PackageName = ?,
@PackageGuid = ?,
@PackageVersionMajor = ?,
@PackageVersionMinor = ?,
@PackageVersionBuild = ?,
@MachineName = ?,
@ExecutionGuid = ?,
@LogicalDate = ?,
@StartTime = ?,
@Operator = ?,
@ETLAuditKey = ? OUTPUT"