update readme

readme.md

@@ -93,7 +93,7 @@ by the Document. When the Document is deleted, so are all the nodes it contains.
 
 ### White Space
 
-#### Whitespace Preservation (default)
+#### Whitespace Preservation (default, PRESERVE_WHITESPACE)
 
 Microsoft has an excellent article on white space: http://msdn.microsoft.com/en-us/library/ms256097.aspx
 
@@ -125,7 +125,7 @@ valuable. TinyXML-2 sees these as the same XML:
 
 	<document><data>1</data><data>2</data><data>3</data></document>
 
-#### Whitespace Collapse
+#### Whitespace Collapse (COLLAPSE_WHITESPACE)
 
 For some applications, it is preferable to collapse whitespace. Collapsing
 whitespace gives you "HTML-like" behavior, which is sometimes more suitable
@@ -143,7 +143,15 @@ However, you may also use COLLAPSE_WHITESPACE, which will:
 Note that (currently) there is a performance impact for using COLLAPSE_WHITESPACE.
 It essentially causes the XML to be parsed twice.
 
-#### Error Reporting
+#### Pedantic Whitespace (PEDANTIC_WHITESPACE)
+
+For applications that need to know about text nodes that are composed entirely of 
+whitespace, PEDANTIC_WHITESPACE is available. PEDANTIC_WHITESPACE maintains all the
+whilespace between elements. 
+
+PEDANTIC_WHITESPACE is a new mode and not as tested as the other whitespace modes.
+
+### Error Reporting
 
 TinyXML-2 reports the line number of any errors in an XML document that
 cannot be parsed correctly. In addition, all nodes (elements, declarations,