1 files changed, 2 insertions, 1 deletions
diff --git a/lib/shadow.h b/lib/shadow.h
index cbe40dbb..4a05c860 100644
--- a/lib/shadow.h
+++ b/lib/shadow.h
@@ -9,6 +9,7 @@
 
 #include <map>
 #include <memory>
+#include <functional>
 #include <zen/zstring.h>
 #include <zen/file_error.h>
 
@@ -20,7 +21,7 @@ class ShadowCopy //take and buffer Windows Volume Shadow Copy snapshots as neede
 public:
     ShadowCopy() {}
 
-    Zstring makeShadowCopy(const Zstring& inputFile); //throw FileError; returns filename on shadow copy
+    Zstring makeShadowCopy(const Zstring& inputFile, const std::function<void(const Zstring&)>& onBeforeMakeVolumeCopy); //throw FileError; returns filename on shadow copy
 
 private:
     ShadowCopy(const ShadowCopy&);