diff --git a/README.md b/README.md
index 8f0c87e..cb4674e 100644
--- a/README.md
+++ b/README.md
@@ -958,6 +958,7 @@ Operator | Description | Added
 <-> | Euclidean distance | unreleased
 <#> | negative inner product | unreleased
 <=> | cosine distance | unreleased
+<+> | taxicab distance | unreleased
 
 ### Sparsevec Functions