diff --git a/prodos.utils.cpp b/prodos.utils.cpp
index 6205c61..0dd132b 100644
--- a/prodos.utils.cpp
+++ b/prodos.utils.cpp
@@ -3,6 +3,9 @@
     const size_t PRODOS_BLOCK_SIZE   = 0x200; // 512 bytes/block
     const size_t PRODOS_ROOT_BLOCK   = 2;
     const int    PRODOS_MAX_FILENAME = 15;
+
+    const int    PRODOS_ROOT_OFFSET  = PRODOS_ROOT_BLOCK * PRODOS_BLOCK_SIZE;
+
 //  const int    PRODOS_MAX_PATH     = 64; // TODO: Verify
 
     const uint8_t ACCESS_D = 0x80; // Can destroy