diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/Cells/XLCell.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/Cells/XLCell.cs
index 65969d0..261e775 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/Cells/XLCell.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/Cells/XLCell.cs
@@ -158,7 +158,7 @@
         {
             FormulaA1 = String.Empty;
             _richText = null;
-            if (value is String)
+            if (value is String || value is char)
             {
                 _cellValue = value.ToString();
                 _dataType = XLCellValues.Text;
@@ -182,7 +182,6 @@
             else if (
                 value is sbyte
                 || value is byte
-                || value is char
                 || value is short
                 || value is ushort
                 || value is int
diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/Comments/IXLComment.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/Comments/IXLComment.cs
index 8bc72e3..9e538d7 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/Comments/IXLComment.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/Comments/IXLComment.cs
@@ -11,9 +11,9 @@
         Boolean Visible { get; set; }
         IXLComment SetVisible(); IXLComment SetVisible(Boolean value);
 
-        void AddSignature();
-        void AddSignature(string username);
-        void AddNewLine();
+        IXLRichString AddSignature();
+        IXLRichString AddSignature(string username);
+        IXLRichString AddNewLine();
     }
 
 }
diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/Comments/XLComment.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/Comments/XLComment.cs
index 5ac310a..1d96f18 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/Comments/XLComment.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/Comments/XLComment.cs
@@ -42,20 +42,21 @@
             return this;
         }
 
-        public void AddSignature() 
+        public IXLRichString AddSignature() 
         {
             // existing Author might be someone else hence using current user name here
-            this.AddSignature(Environment.UserName);
+            return AddSignature(Environment.UserName);
+
         }
 
-        public void AddSignature(string username) 
+        public IXLRichString AddSignature(string username) 
         {
-            this.AddText(string.Format("{0}:{1}", username, Environment.NewLine)).SetBold();
+            return AddText(string.Format("{0}:{1}", username, Environment.NewLine)).SetBold();
         }
 
-        public void AddNewLine() 
+        public IXLRichString AddNewLine() 
         {
-            this.AddText(Environment.NewLine);
+            return AddText(Environment.NewLine);
         }
 
         public Boolean Visible { get; set; }	public IXLComment SetVisible() { Visible = true; return this; }	public IXLComment SetVisible(Boolean value) { Visible = value; return this; }
diff --git a/ClosedXML/ClosedXML/ClosedXML/Properties/AssemblyInfo.cs b/ClosedXML/ClosedXML/ClosedXML/Properties/AssemblyInfo.cs
index f3d1841..52da6b8 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Properties/AssemblyInfo.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Properties/AssemblyInfo.cs
@@ -31,6 +31,6 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.58.0.0")]
-[assembly: AssemblyFileVersion("0.58.0.0")]
+[assembly: AssemblyVersion("0.58.1.0")]
+[assembly: AssemblyFileVersion("0.58.1.0")]
 [assembly: System.Runtime.CompilerServices.InternalsVisibleTo("ClosedXML_Tests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100a1fb8ba59167fe734d64128ca73d32c45cb8a117246d09c95c8769db88fe332b0a3396bedd0ea48ee42b0e5796fec0798ca5cb628a9a6de80d35d6c67b936ca1670347b3d4f2b769c8ce2ddcf959dbac6bcd88e6c08751ea1fffa0522de3507193e7035305a8aa008d6c88cca1341b3120fa9c347ab3f97e2d772e2709277da5")]
\ No newline at end of file
diff --git a/ClosedXML/ClosedXML/ClosedXML_Net3.5/Properties/AssemblyInfo.cs b/ClosedXML/ClosedXML/ClosedXML_Net3.5/Properties/AssemblyInfo.cs
index 046f2c4..9b67a8d 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Net3.5/Properties/AssemblyInfo.cs
+++ b/ClosedXML/ClosedXML/ClosedXML_Net3.5/Properties/AssemblyInfo.cs
@@ -31,5 +31,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.58.0.0")]
-[assembly: AssemblyFileVersion("0.58.0.0")]
+[assembly: AssemblyVersion("0.58.1.0")]
+[assembly: AssemblyFileVersion("0.58.1.0")]