diff --git a/src/builtin/functions/selector.rs b/src/builtin/functions/selector.rs
index 4015796..5773a80 100644
--- a/src/builtin/functions/selector.rs
+++ b/src/builtin/functions/selector.rs
@@ -9,7 +9,7 @@ use crate::{
     value::Value,
 };
 
-fn is_superselector(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
+pub(crate) fn is_superselector(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
     args.max_args(2)?;
     let parent_selector = args
         .get_err(0, "super")?
@@ -21,7 +21,7 @@ fn is_superselector(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<V
     ))
 }
 
-fn simple_selectors(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
+pub(crate) fn simple_selectors(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
     args.max_args(1)?;
     // todo: Value::to_compound_selector
     let selector = args
@@ -51,7 +51,7 @@ fn simple_selectors(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<V
     ))
 }
 
-fn selector_parse(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
+pub(crate) fn selector_parse(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
     args.max_args(1)?;
     Ok(args
         .get_err(0, "selector")?
@@ -59,7 +59,7 @@ fn selector_parse(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Val
         .into_value())
 }
 
-fn selector_nest(args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
+pub(crate) fn selector_nest(args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
     let span = args.span();
     let selectors = args.get_variadic()?;
     if selectors.is_empty() {
@@ -80,7 +80,7 @@ fn selector_nest(args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
         .into_value())
 }
 
-fn selector_append(args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
+pub(crate) fn selector_append(args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
     let span = args.span();
     let selectors = args.get_variadic()?;
     if selectors.is_empty() {
@@ -138,7 +138,7 @@ fn selector_append(args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value>
         .into_value())
 }
 
-fn selector_extend(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
+pub(crate) fn selector_extend(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
     args.max_args(3)?;
     let selector = args
         .get_err(0, "selector")?
@@ -153,7 +153,7 @@ fn selector_extend(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Va
     Ok(Extender::extend(selector.0, source.0, target.0, args.span())?.to_sass_list())
 }
 
-fn selector_replace(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
+pub(crate) fn selector_replace(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
     args.max_args(3)?;
     let selector = args
         .get_err(0, "selector")?
@@ -167,7 +167,7 @@ fn selector_replace(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<V
     Ok(Extender::replace(selector.0, source.0, target.0, args.span())?.to_sass_list())
 }
 
-fn selector_unify(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
+pub(crate) fn selector_unify(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<Value> {
     args.max_args(2)?;
     let selector1 = args
         .get_err(0, "selector1")?
diff --git a/src/builtin/mod.rs b/src/builtin/mod.rs
index 56375bd..e1b3d41 100644
--- a/src/builtin/mod.rs
+++ b/src/builtin/mod.rs
@@ -1,4 +1,4 @@
 mod functions;
 pub(crate) mod modules;
 
-pub(crate) use functions::{math, meta, Builtin, GLOBAL_FUNCTIONS};
+pub(crate) use functions::{math, meta, selector, Builtin, GLOBAL_FUNCTIONS};
diff --git a/src/builtin/modules/selector.rs b/src/builtin/modules/selector.rs
index 47d58dc..32a7860 100644
--- a/src/builtin/modules/selector.rs
+++ b/src/builtin/modules/selector.rs
@@ -1,5 +1,22 @@
 use crate::{
-    args::CallArgs, builtin::modules::Module, error::SassResult, parse::Parser, value::Value,
+    args::CallArgs,
+    builtin::modules::Module,
+    builtin::selector::{
+        is_superselector, selector_append, selector_extend, selector_nest, selector_parse,
+        selector_replace, selector_unify, simple_selectors,
+    },
+    error::SassResult,
+    parse::Parser,
+    value::Value,
 };
 
-pub(crate) fn declare(_f: &mut Module) {}
+pub(crate) fn declare(f: &mut Module) {
+    f.insert_builtin("is-superselector", is_superselector);
+    f.insert_builtin("append", selector_append);
+    f.insert_builtin("extend", selector_extend);
+    f.insert_builtin("nest", selector_nest);
+    f.insert_builtin("parse", selector_parse);
+    f.insert_builtin("replace", selector_replace);
+    f.insert_builtin("unify", selector_unify);
+    f.insert_builtin("simple-selectors", simple_selectors);
+}