diff --git a/README.md b/README.md
index 569706f..d1c51fe 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,11 @@ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+CAUTION
+=======
+THIS IS A WORK IN PROGRESS.  NO OFFICIAL RELEASE HAS BEEN MADE.
+USE AT YOUR OWN RISK.
+
 Requirements
 ============