diff --git a/README.md b/README.md
index 7f8a50dc..3828884e 100644
--- a/README.md
+++ b/README.md
@@ -106,7 +106,7 @@ for sols.Next() {
 |----------------------|--------------------------------------------------|:----:|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------|
 | Control Constructs   | `true`                                           |  *   | Always succeeds.                                                                                                                                                                                                | Prolog                                                                                   |
 |                      | `fail`                                           |  *   | Always fails.                                                                                                                                                                                                   | Prolog                                                                                   |
-|                      | `false`                                          |      | Synonym for `fail`.                                                                                                                                                                                             | Prolog                                                                                   |
+|                      | `false`                                          |  *   | Synonym for `fail`.                                                                                                                                                                                             | Prolog                                                                                   |
 |                      | `call(Goal)`                                     |  *   | Calls `Goal`.                                                                                                                                                                                                   | [Go](https://pkg.go.dev/github.com/ichiban/prolog/engine#State.Call)                     |
 |                      | `!`                                              |  *   | Cut.                                                                                                                                                                                                            | Prolog                                                                                   |
 |                      | `P, Q`                                           |  *   | Conjunction.                                                                                                                                                                                                    | Prolog                                                                                   |