1 files changed, 2 insertions, 0 deletions
diff --git a/zix/ring.h b/zix/ring.h
index 67b71f5..3abb1e8 100644
--- a/zix/ring.h
+++ b/zix/ring.h
@@ -32,6 +32,8 @@ typedef struct ZixRingImpl ZixRing;
 /**
    Create a new ring.
    @param size Size in bytes (note this may be rounded up).
+
+   At most @c size - 1 bytes may be stored in the ring at once.
 */
 ZixRing*
 zix_ring_new(uint32_t size);