diff --git a/README.md b/README.md
index dab78e7e..b5b4bee3 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,8 @@ The following predicates are built-in to rusty-wam.
 * catch/3
 * duplicate_term/2
 * false/0
-* (\+)/1
+* (\\+)/1
+* (=)/2
 * throw/1
 * var/1