diff --git a/lang/boolean.c b/lang/boolean.c
index c2fe8d6..fcb7dfa 100644
--- a/lang/boolean.c
+++ b/lang/boolean.c
@@ -30,17 +30,17 @@
 	return boolean->value;
 }
 
-static void boolean_not(VmState state, Object obj, void *priv) {
+static void boolean_invert(VmState state, Object obj, void *priv) {
 	(void)priv;
 	int arg_count = vm_stack_depth(state);
-	abort_if(arg_count != 1, "boolean_not called with extra arguments");
+	abort_if(arg_count != 1, "boolean_invert called with extra arguments");
 	bool value = boolean_value(obj);
-	bool not = !value;
-	vm_stack_set(state, 0, boolean_create(not ));
+	bool invert = !value;
+	vm_stack_set(state, 0, boolean_create(invert ));
 }
 
 static struct object_call calls[] = {
-	{.name = "Not", .handler = boolean_not, .priv = NULL},
+	{.name = "Invert", .handler = boolean_invert, .priv = NULL},
 	{.name = NULL, /* end */}};
 
 static struct object_class boolean_class = {
diff --git a/lang/modules/main.txt b/lang/modules/main.txt
index f7a9f77..44f26ae 100644
--- a/lang/modules/main.txt
+++ b/lang/modules/main.txt
@@ -1,6 +1,6 @@
 Function BoolTest
 Set A To True
-Set B To A Not
+Set B To A Invert
 Return B
 EndFunction
 Function NoneTest