diff --git a/libisofs/libisofs.h b/libisofs/libisofs.h
index bf840dc..0d29cad 100755
--- a/libisofs/libisofs.h
+++ b/libisofs/libisofs.h
@@ -56,6 +56,11 @@ struct iso_volume *iso_volume_new_with_root(const char *volume_id,
  */
 void iso_volume_free(struct iso_volume *volume);
 
+/**
+ * Free a set of data volumes.
+ */
+void iso_volset_free(struct iso_volset *volume);
+
 /**
  * Get the root directory for a volume.
  */