diff --git a/eng/Signing.props b/eng/Signing.props
index 2a17aa85072c33f709529fca06cc66d696797200..24f1f0df6cb1a3950501c0603f02a4363cd7e8bd 100644
--- a/eng/Signing.props
+++ b/eng/Signing.props
@@ -16,10 +16,10 @@
     <FileSignInfo Include="Microsoft.CodeAnalysis.VisualBasic.ExpressionEvaluator.ResultProvider.dll" PublicKeyToken="31bf3856ad364e35" TargetFramework=".NETStandard,Version=v1.3" CertificateName="Microsoft101240624"/>
     <FileSignInfo Include="Microsoft.CodeAnalysis.ExpressionEvaluator.FunctionResolver.dll" PublicKeyToken="31bf3856ad364e35" TargetFramework=".NETStandard,Version=v1.3" CertificateName="Microsoft101240624"/>
 
-    <FileSignInfo Include="Microsoft.CodeAnalysis.ExpressionEvaluator.ResultProvider.dll" PublicKeyToken="31bf3856ad364e35" TargetFramework=".NETFramework,Version=v2.0" CertificateName="MicrosoftSHA1Win8WinBlue"/>
-    <FileSignInfo Include="Microsoft.CodeAnalysis.CSharp.ExpressionEvaluator.ResultProvider.dll" PublicKeyToken="31bf3856ad364e35" TargetFramework=".NETFramework,Version=v2.0" CertificateName="MicrosoftSHA1Win8WinBlue"/>
-    <FileSignInfo Include="Microsoft.CodeAnalysis.VisualBasic.ExpressionEvaluator.ResultProvider.dll" PublicKeyToken="31bf3856ad364e35" TargetFramework=".NETFramework,Version=v2.0" CertificateName="MicrosoftSHA1Win8WinBlue"/>
-    <FileSignInfo Include="Microsoft.CodeAnalysis.ExpressionEvaluator.FunctionResolver.dll" PublicKeyToken="31bf3856ad364e35" TargetFramework=".NETFramework,Version=v4.5" CertificateName="MicrosoftSHA1Win8WinBlue"/>
+    <FileSignInfo Include="Microsoft.CodeAnalysis.ExpressionEvaluator.ResultProvider.dll" PublicKeyToken="31bf3856ad364e35" TargetFramework=".NETFramework,Version=v2.0" CertificateName="MicrosoftWin8WinBlue"/>
+    <FileSignInfo Include="Microsoft.CodeAnalysis.CSharp.ExpressionEvaluator.ResultProvider.dll" PublicKeyToken="31bf3856ad364e35" TargetFramework=".NETFramework,Version=v2.0" CertificateName="MicrosoftWin8WinBlue"/>
+    <FileSignInfo Include="Microsoft.CodeAnalysis.VisualBasic.ExpressionEvaluator.ResultProvider.dll" PublicKeyToken="31bf3856ad364e35" TargetFramework=".NETFramework,Version=v2.0" CertificateName="MicrosoftWin8WinBlue"/>
+    <FileSignInfo Include="Microsoft.CodeAnalysis.ExpressionEvaluator.FunctionResolver.dll" PublicKeyToken="31bf3856ad364e35" TargetFramework=".NETFramework,Version=v4.5" CertificateName="MicrosoftWin8WinBlue"/>
 
     <FileSignInfo Include="System.Collections.Immutable.dll" CertificateName="Microsoft101240624"/>
     <FileSignInfo Include="System.Reflection.Metadata.dll" CertificateName="Microsoft101240624"/>
diff --git a/src/EditorFeatures/CSharpTest/RefactoringHelpers/RefactoringHelpersTests.cs b/src/EditorFeatures/CSharpTest/RefactoringHelpers/RefactoringHelpersTests.cs
index ff45618722bbc9975e3baf410bedc116649f8f8e..bbe8da9f993e551fbb1cdebd03e54c7c7ef89163 100644
--- a/src/EditorFeatures/CSharpTest/RefactoringHelpers/RefactoringHelpersTests.cs
+++ b/src/EditorFeatures/CSharpTest/RefactoringHelpers/RefactoringHelpersTests.cs
@@ -753,7 +753,6 @@ class Test2Attribute : Attribute { }
 }";
             await TestAsync<MethodDeclarationSyntax>(testText);
         }
-
         #endregion
 
         #region Extractions general
@@ -1014,7 +1013,6 @@ C LocalFunction(C c)
 }";
             await TestMissingAsync<LocalFunctionStatementSyntax>(testText);
         }
-
         #endregion
 
         #region Test predicate
@@ -1511,7 +1509,6 @@ int N(int a)
 }";
             await TestAsync<ArgumentSyntax>(testText, predicate: n => n.Parent is TupleExpressionSyntax);
         }
-
         #endregion
     }
 }
diff --git a/src/Features/Core/Portable/CodeRefactorings/AbstractRefactoringHelpersService.cs b/src/Features/Core/Portable/CodeRefactorings/AbstractRefactoringHelpersService.cs
index b23d1557499dd79ae715e0acfcbafbc3b6785f01..a63016862cd6f9f3d18a41fe314b1fd8dbc0c183 100644
--- a/src/Features/Core/Portable/CodeRefactorings/AbstractRefactoringHelpersService.cs
+++ b/src/Features/Core/Portable/CodeRefactorings/AbstractRefactoringHelpersService.cs
@@ -51,12 +51,11 @@ internal abstract class AbstractRefactoringHelpersService<TExpressionSyntax, TAr
                 // want the whole node `var a = b;`
 
                 // Handle selections:
-                // - The smallest node whose FullSpan includes the whole (trimmed) selection
+                // - Most/the whole wanted Node is selected (e.g. `C [|Fun() {}|]`
+                //   - The smallest node whose FullSpan includes the whole (trimmed) selection
                 //   - Using FullSpan is important because it handles over-selection with comments
-                // - Travels upwards through same-sized (FullSpan) nodes, extracting
-                // - Handles situations where:
-                //  - Token with wanted Node as direct parent is selected (e.g. IdentifierToken for LocalFunctionStatement: `C [|Fun|]() {}`) 
-                //  - Most/the whole wanted Node is selected (e.g. `C [|Fun() {}|]`
+                //   - Travels upwards through same-sized (FullSpan) nodes, extracting
+                // - Token with wanted Node as direct parent is selected (e.g. IdentifierToken for LocalFunctionStatement: `C [|Fun|]() {}`) 
                 // Note: Whether we have selection or location has to be checked against original selection because selecting just
                 // whitespace could collapse selectionTrimmed into and empty Location. But we don't want `[|   |]token`
                 // registering as `   [||]token`.
@@ -108,6 +107,8 @@ internal abstract class AbstractRefactoringHelpersService<TExpressionSyntax, TAr
                     // We want to treat more types like expressions, e.g.: ArgumentSyntax should still trigger even if deep-in.
                     if (IsWantedTypeExpressionLike<TSyntaxNode>())
                     {
+                        // Reason to treat Arguments (and potentially others) as Expression-like: 
+                        // https://github.com/dotnet/roslyn/pull/37295#issuecomment-516145904
                         await AddNodesDeepIn(document, location, relevantNodesBuilder, cancellationToken).ConfigureAwait(false);
                     }
                 }
@@ -464,6 +465,7 @@ private static TextSpan GetSpanWithoutAttributes(SyntaxNode node, SyntaxNode roo
             //      //Comment1
             //      [||]object Property1 { get; set; }
             //     the comment node being part of the next token's (`object`) leading trivia and not the AttributeList's node.
+            // - In case only attribute is written we need to be careful to not to use next (unrelated) token as beginning current the node.
             var attributeList = syntaxFacts.GetAttributeLists(node);
             if (attributeList.Any())
             {
diff --git a/src/Features/Core/Portable/CodeRefactorings/IRefactoringHelpersService.cs b/src/Features/Core/Portable/CodeRefactorings/IRefactoringHelpersService.cs
index daa6564090350102935b70e1feccb3a98c0d80db..f80dc3a3d7ff871ce408a363563ac2a7c3cfafe5 100644
--- a/src/Features/Core/Portable/CodeRefactorings/IRefactoringHelpersService.cs
+++ b/src/Features/Core/Portable/CodeRefactorings/IRefactoringHelpersService.cs
@@ -22,7 +22,7 @@ internal interface IRefactoringHelpersService : ILanguageService
         /// - Selection is zero-width and in whitespace that corresponds to a Token whose direct ancestor is of type of type <typeparamref name="TSyntaxNode"/>.
         /// - Selection is zero-width and in a header (defined by ISyntaxFacts helpers) of an node of type of type <typeparamref name="TSyntaxNode"/>.
         /// - Token whose direct parent of type <typeparamref name="TSyntaxNode"/> is selected.
-        /// - Wanted node is an expression / argument and curent empty selection is within such syntax node (arbitrarily deep) on its first line.
+        /// - Selection is zero-width and wanted node is an expression / argument with selection within such syntax node (arbitrarily deep) on its first line.
         /// - Whole node of a type <typeparamref name="TSyntaxNode"/> is selected.
         /// </para>
         /// <para>