diff --git a/README.md b/README.md
index 3e2b208..7c4ca3d 100644
--- a/README.md
+++ b/README.md
@@ -24,8 +24,8 @@ will build tests for
 
 * SipHash-2-4, the default version of SipHash returning 64-bit tags
 * SipHash-2-4  with doubled tag size, i.e. 128-bit tags
-* HalfSipHash-2-4, a version of SipHash working with 32-bit words and
-  returning 32-bit tags by default
+* HalfSipHash-2-4, an **experimental** version of SipHash working with
+  32-bit words and returning 32-bit tags by default
 * HalfSipHash-2-4 with doubled tag size, i.e. 64-bit tags