diff --git a/src/footnote.rs b/src/footnote.rs
new file mode 100644
index 0000000..859cf7b
--- /dev/null
+++ b/src/footnote.rs
@@ -0,0 +1,24 @@
+use brack_sdk_rs::{ast::AST, MetaData, Type};
+use extism_pdk::{plugin_fn, FnResult, Json, WithReturnCode};
+
+#[plugin_fn]
+pub fn metadata_footnote() -> FnResult<Json<MetaData>> {
+    Ok(Json(MetaData {
+        command_name: "^".to_string(),
+        call_name: "footnote".to_string(),
+        argument_types: vec![], // TODO: macro does not have the custom type,
+        return_type: Type::TAST,
+    }))
+}
+
+#[plugin_fn]
+pub fn footnote(Json((overwhole_ast, id)): Json<(AST, String)>) -> FnResult<Json<AST>> {
+    let AST::Document(mut node) = overwhole_ast.clone() else {
+        return Err(WithReturnCode::new(
+            anyhow::anyhow!("footnote must be called in Document"),
+            1,
+        ));
+    };
+    node.id = format!("footnote-{}", id);
+    Ok(Json(AST::Document(node)))
+}
diff --git a/src/lib.rs b/src/lib.rs
index e6ad569..726363c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,38 +1,4 @@
-use extism_pdk::*;
-use serde::Deserialize;
-
-#[derive(Debug, Deserialize)]
-pub enum PluginArgument {
-    Arg1(String),
-    Arg2(String, String),
-    Arg3(String, String, String),
-    Arg4(String, String, String, String),
-    Arg5(String, String, String, String, String),
-    Arg6(String, String, String, String, String, String),
-    Arg7(String, String, String, String, String, String, String),
-    Arg8(String, String, String, String, String, String, String, String),
-}
-
-#[plugin_fn]
-pub fn bold(args: Json<PluginArgument>) -> FnResult<String> {
-    let text = match args.0 {
-        PluginArgument::Arg1(text) => text,
-        _ => return Err(WithReturnCode::new(anyhow::anyhow!("a"), 1)),
-    };
-    Ok(format!("<b style=\"font-weight:bold;\">{}</b>", text))
-}
-
-#[plugin_fn]
-pub fn anchor(args: Json<PluginArgument>) -> FnResult<String> {
-    match args.0 {
-        PluginArgument::Arg1(href) => {
-            Ok(format!("<a href=\"{}\">{}</a>", href, href))
-        },
-        PluginArgument::Arg2(text, href) => {
-            Ok(format!("<a href=\"{}\">{}</a>", href, text))
-        },
-        _ => {
-            Err(WithReturnCode::new(anyhow::anyhow!("a"), 1))
-        },
-    }
-}
+pub mod anchor;
+pub mod bold;
+pub mod footnote;
+pub mod italic;