diff --git a/README.md b/README.md
index 1d8708c4..b938794f 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ ideally, very fast) [Shen](http://shenlanguage.org) implementation.
 
 The following predicates are built-in to rusty-wam.
 
-* atomic
+* atomic/1
 * call/N (0 <= N <= 62)
 * catch/3
 * duplicate_term/2