diff --git a/CHANGELOG.md b/CHANGELOG.md
index 631bd9e6..d6b27d42 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,9 +4,11 @@
 
 ### Added
 
-- **aiken**: Generate a default 'placeholder' validator when using `aiken new`. See [#1061](https://github.com/aiken-lang/aiken/pull/1061) @Waalge
-- **aiken-lang**: New builtins 'constr_fields' and 'constr_index'. @Microproofs
-- **aiken-lang**: New builtins from Chang2 hardfork (except for writeBits). @Microproofs, @KtorZ
+- **aiken**: Generate a default _'placeholder.ak'_ validator when using `aiken new`. See [#1061](https://github.com/aiken-lang/aiken/pull/1061) @Waalge
+- **aiken-lang**: New builtins [`unconstr_fields`](https://aiken-lang.github.io/prelude/aiken/builtin.html#unconstr_fields) and [`unconstr_index`](https://aiken-lang.github.io/prelude/aiken/builtin.html#unconstr_index). @Microproofs
+- **aiken-lang**: Added builtins from Chang2 hardfork (except for writeBits). @Microproofs, @KtorZ
+    - [Bitwise operations](https://aiken-lang.github.io/prelude/aiken/builtin.html#Bitwise)
+    - [Ripemd-160 hashing](https://aiken-lang.github.io/prelude/aiken/builtin.html#ripemd_160)
 - **aiken-projects**: The generated documentation may now include maths typesetting rendered using [KaTex](https://katex.org/). See [#1070](https://github.com/aiken-lang/aiken/pull/1070) @adrian052.
   - Both inline (delimited by single `$` symbols) and blocks (delimited by doubled `$$` symbols) are now parsed and rendered as SVG upon generating documentation. For example:
 
diff --git a/crates/aiken-lang/src/builtins.rs b/crates/aiken-lang/src/builtins.rs
index 563d07b6..08179ba3 100644
--- a/crates/aiken-lang/src/builtins.rs
+++ b/crates/aiken-lang/src/builtins.rs
@@ -519,11 +519,11 @@ pub fn plutus(id_gen: &IdGenerator) -> TypeInfo {
 
     let index_tipo = Type::function(vec![Type::data()], Type::int());
     plutus.values.insert(
-        "constr_index".to_string(),
+        "unconstr_index".to_string(),
         ValueConstructor::public(
             index_tipo,
             ValueConstructorVariant::ModuleFn {
-                name: "constr_index".to_string(),
+                name: "unconstr_index".to_string(),
                 field_map: None,
                 module: "aiken/builtin".to_string(),
                 arity: 1,
@@ -535,11 +535,11 @@ pub fn plutus(id_gen: &IdGenerator) -> TypeInfo {
 
     let fields_tipo = Type::function(vec![Type::data()], Type::list(Type::data()));
     plutus.values.insert(
-        "constr_fields".to_string(),
+        "unconstr_fields".to_string(),
         ValueConstructor::public(
             fields_tipo,
             ValueConstructorVariant::ModuleFn {
-                name: "constr_fields".to_string(),
+                name: "unconstr_fields".to_string(),
                 field_map: None,
                 module: "aiken/builtin".to_string(),
                 arity: 1,
@@ -1043,7 +1043,7 @@ pub fn prelude_functions(
 ) -> IndexMap<FunctionAccessKey, TypedFunction> {
     let mut functions = IndexMap::new();
 
-    let constr_index_body = TypedExpr::Call {
+    let unconstr_index_body = TypedExpr::Call {
         location: Span::empty(),
         tipo: Type::int(),
         fun: TypedExpr::local_var(
@@ -1069,7 +1069,7 @@ pub fn prelude_functions(
         }],
     };
 
-    let constr_index_func = Function {
+    let unconstr_index_func = Function {
         arguments: vec![TypedArg {
             arg_name: ArgName::Named {
                 name: "constr".to_string(),
@@ -1091,23 +1091,23 @@ pub fn prelude_functions(
             }.to_string()
         ),
         location: Span::empty(),
-        name: "constr_index".to_string(),
+        name: "unconstr_index".to_string(),
         public: true,
         return_annotation: None,
         return_type: Type::int(),
         end_position: 0,
-        body: constr_index_body,
+        body: unconstr_index_body,
     };
 
     functions.insert(
         FunctionAccessKey {
             module_name: "aiken/builtin".to_string(),
-            function_name: "constr_index".to_string(),
+            function_name: "unconstr_index".to_string(),
         },
-        constr_index_func,
+        unconstr_index_func,
     );
 
-    let constr_fields_body = TypedExpr::Call {
+    let unconstr_fields_body = TypedExpr::Call {
         location: Span::empty(),
         tipo: Type::list(Type::data()),
         fun: TypedExpr::local_var(
@@ -1133,7 +1133,7 @@ pub fn prelude_functions(
         }],
     };
 
-    let constr_fields_func = Function {
+    let unconstr_fields_func = Function {
         arguments: vec![TypedArg {
             arg_name: ArgName::Named {
                 name: "constr".to_string(),
@@ -1155,20 +1155,20 @@ pub fn prelude_functions(
             }.to_string()
         ),
         location: Span::empty(),
-        name: "constr_fields".to_string(),
+        name: "unconstr_fields".to_string(),
         public: true,
         return_annotation: None,
         return_type: Type::list(Type::data()),
         end_position: 0,
-        body: constr_fields_body,
+        body: unconstr_fields_body,
     };
 
     functions.insert(
         FunctionAccessKey {
             module_name: "aiken/builtin".to_string(),
-            function_name: "constr_fields".to_string(),
+            function_name: "unconstr_fields".to_string(),
         },
-        constr_fields_func,
+        unconstr_fields_func,
     );
 
     // /// Negate the argument. Useful for map/fold and pipelines.
diff --git a/examples/acceptance_tests/116/lib/tests.ak b/examples/acceptance_tests/116/lib/tests.ak
index 29aaa94b..44a283e1 100644
--- a/examples/acceptance_tests/116/lib/tests.ak
+++ b/examples/acceptance_tests/116/lib/tests.ak
@@ -1,12 +1,23 @@
-use aiken/builtin.{constr_index}
+use aiken/builtin.{unconstr_fields, unconstr_index}
 
-test baz() {
+test bar() {
   let x = Some("bar")
 
-  expect [bar] = x |> builtin.constr_fields
+  expect [bar] = x |> builtin.unconstr_fields
 
   and {
-    constr_index(x) == 0,
+    unconstr_index(x) == 0,
     builtin.un_b_data(bar) == "bar",
   }
 }
+
+test baz() {
+  let x = Some("baz")
+
+  expect [baz] = x |> unconstr_fields
+
+  and {
+    builtin.unconstr_index(x) == 0,
+    builtin.un_b_data(baz) == "baz",
+  }
+}