diff --git a/src/Expr.ts b/src/Expr.ts
index 464fe2d..42a0b8f 100644
--- a/src/Expr.ts
+++ b/src/Expr.ts
@@ -59,6 +59,7 @@ export const Expr = (() => {
     like,
     or,
     and,
+    not,
     notNull,
     lowerThan,
     lowerThanOrEqual,
@@ -221,6 +222,14 @@ export const Expr = (() => {
     });
   }
 
+  function not<E extends IExprUnknow>(expr: E): IExpr<boolean, E[TYPES]['nullable']> {
+    return create(builder.Expr.not(expr.ast), {
+      parse: Datatype.boolean.parse,
+      nullable: expr[PRIV].nullable,
+      dependencies: expr[PRIV].dependencies,
+    });
+  }
+
   function notNull(expr: IExprUnknow): IExpr<boolean, false> {
     return create(builder.Expr.notNull(expr.ast), { parse: Datatype.boolean.parse, nullable: false });
   }