diff --git a/collocatordb.h b/collocatordb.h
index dae2047..8038d70 100644
--- a/collocatordb.h
+++ b/collocatordb.h
@@ -28,6 +28,9 @@
     double right_npmi;
     double dice;
     double logdice;
+    double af;
+    int window;
+    int af_window;
   };
 
     class CollocatorIterator : public Iterator  {