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diff --git a/TODO b/TODO
index ec3bfa3..eb5a537 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1,7 @@
 TODO list (in order of priority)
 ---------
 
+- sort out synchronization issues, how much should we lock?
 - add tests for sparse files and funny read/write operations
 - allow for size_t and off_t (check int4 which should
   be int8, use be64ton and not htonl), flag for 64-bit