diff --git a/core/classes/classes-docs.factor b/core/classes/classes-docs.factor
index 130844e797..147714692d 100644
--- a/core/classes/classes-docs.factor
+++ b/core/classes/classes-docs.factor
@@ -5,7 +5,7 @@ classes.predicate ;
 IN: classes
 
 ARTICLE: "builtin-classes" "Built-in classes"
-"Every object is an instance of to exactly one canonical " { $emphasis "built-in class" } " which defines its layout in memory and basic behavior."
+"Every object is an instance of exactly one canonical " { $emphasis "built-in class" } " which defines its layout in memory and basic behavior."
 $nl
 "Corresponding to every built-in class is a built-in type number. An object can be asked for its built-in type number:"
 { $subsection type }