Index: /FCKeditor.Java/trunk/java-core/src/main/java/net/fckeditor/FCKeditor.java
===================================================================
--- /FCKeditor.Java/trunk/java-core/src/main/java/net/fckeditor/FCKeditor.java	(revision 2577)
+++ /FCKeditor.Java/trunk/java-core/src/main/java/net/fckeditor/FCKeditor.java	(revision 2578)
@@ -226,4 +226,6 @@
 				sb.append(""");
 				break;
+			// XML actually defines ' as entity for the apostrophe but we
+			// user rather the numerical reference to avoid XHTML 1.0 validation problems
 			case '\'':
 				sb.append("'");