diff --git a/src/net/sourceforge/schemaspy/DbAnalyzer.java b/src/net/sourceforge/schemaspy/DbAnalyzer.java
index 3c31a8f..169ba0f 100644
--- a/src/net/sourceforge/schemaspy/DbAnalyzer.java
+++ b/src/net/sourceforge/schemaspy/DbAnalyzer.java
@@ -36,7 +36,7 @@ public int compare(Object object1, Object object2) {
 
             for (Iterator columnIter = table.getColumns().iterator(); columnIter.hasNext(); ) {
                 TableColumn column = (TableColumn)columnIter.next();
-                if (column.getParents().isEmpty())
+                if (!column.isForeignKey())
                     columnsWithoutParents.add(column);
             }
         }
diff --git a/src/net/sourceforge/schemaspy/model/Table.java b/src/net/sourceforge/schemaspy/model/Table.java
index 7611157..9a19585 100755
--- a/src/net/sourceforge/schemaspy/model/Table.java
+++ b/src/net/sourceforge/schemaspy/model/Table.java
@@ -410,7 +410,7 @@ public void unlinkParents() {
     public boolean isRoot() {
         for (Iterator iter = columns.values().iterator(); iter.hasNext(); ) {
             TableColumn column = (TableColumn)iter.next();
-            if (!column.getParents().isEmpty()) {
+            if (column.isForeignKey()) {
                 return false;
             }
         }
diff --git a/src/net/sourceforge/schemaspy/model/TableColumn.java b/src/net/sourceforge/schemaspy/model/TableColumn.java
index fd2a127..14c9238 100755
--- a/src/net/sourceforge/schemaspy/model/TableColumn.java
+++ b/src/net/sourceforge/schemaspy/model/TableColumn.java
@@ -105,6 +105,14 @@ public boolean isUnique() {
     public boolean isPrimary() {
         return table.getPrimaryColumns().contains(this);
     }
+    
+    /**
+     * Returns <code>true</code> if this column points to another table's primary key.
+     * @return
+     */
+    public boolean isForeignKey() {
+        return !parents.isEmpty();
+    }
 
     public Object getDefaultValue() {
         return defaultValue;