diff --git a/README.md b/README.md
index 689861e8..3a6c287d 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,9 @@ coverage.  See `test_coverage.txt` for the current coverage (using gocov).  On a
 UNIX-like OS, the script `cov_report.sh` can be used to generate the report.
 Package btcdb is licensed under the liberal ISC license.
 
+Note that the main `Db` interface is not yet finalized, so it is subject to
+change.
+
 ## Sample Use
 
 ```Go