### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core
Index: model/org/eclipse/jdt/core/ICompilationUnit.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/core/ICompilationUnit.java,v
retrieving revision 1.70
diff -u -r1.70 ICompilationUnit.java
--- model/org/eclipse/jdt/core/ICompilationUnit.java	23 Sep 2009 18:22:57 -0000	1.70
+++ model/org/eclipse/jdt/core/ICompilationUnit.java	10 Nov 2009 19:46:39 -0000
@@ -402,7 +402,13 @@
 ICompilationUnit getPrimary();
 /**
  * Returns the working copy owner of this working copy.
- * Returns null if it is not a working copy or if it has no owner.
+ * 
+ * Returns null if:
+ * <ul>
+ * <li>it is not a working copy,</li>
+ * <li>or it has no owner,</li>
+ * <li>or it is a primary working copy.</li>
+ * </ul> 
  *
  * @return WorkingCopyOwner the owner of this working copy or <code>null</code>
  * @since 3.0