diff --git a/libscan/scan.h b/libscan/scan.h
index 802ae77..439485c 100644
--- a/libscan/scan.h
+++ b/libscan/scan.h
@@ -93,6 +93,7 @@ typedef struct meta_line {
     };
 } meta_line_t;
 
+#define USER_UID_COUNT 64
 
 typedef struct document {
     unsigned char uuid[16];
@@ -102,6 +103,7 @@ typedef struct document {
     int mtime;
     short base;
     short ext;
+    uid_t users[USER_UID_COUNT];
     meta_line_t *meta_head;
     meta_line_t *meta_tail;
     char *filepath;