diff --git a/btree.cpp b/btree.cpp
index 610dedd..31c212a 100644
--- a/btree.cpp
+++ b/btree.cpp
@@ -130,6 +130,17 @@
 } // bTree::setHeight
 
 void
+bTree::setKeys(uInt32 value) {
+  info->keys = value;
+
+  if (!memoryTree) {
+    if (!vfs->fSeek((int)&info->keys - (int)info)) exit(42);
+    if (!vfs->fWrite(&info->keys, sizeof(info->keys))) exit(42);
+  } // if not memoryTree
+  return;
+} // bTree::getKeys
+
+void
 bTree::setNull(uPtr & u) {
   u.offset = 0;
 } // bTree::setNull
diff --git a/btree.h b/btree.h
index a1cc495..b17c25f 100644
--- a/btree.h
+++ b/btree.h
@@ -26,6 +26,7 @@
   void     setFirstDeleted(uPtr);
   void     setNodes(uInt32);
   void     setHeight(uInt32);
+  void     setKeys(uInt32);
   void     setNull(uPtr &);
  public:
            bTree(char *, uInt32, treeTypes, bTreeVFS *);