diff --git a/crates/xfa/src/fixtures.rs b/crates/xfa/src/fixtures.rs
index a46bee5a2..b075cc811 100644
--- a/crates/xfa/src/fixtures.rs
+++ b/crates/xfa/src/fixtures.rs
@@ -114,10 +114,6 @@ fn assemble(objs: Vec<Vec<u8>>) -> Vec<u8> {
     out
 }
 
-/// A scripted form (JavaScript events): `qty` (initialised to 2, validated ≤ 100) × `price`
-/// (5) = `total` (calculated); a check box `more` that shows the hidden `details` subform;
-/// a table whose `row` (item, amount) repeats, with `addRow`, `removeRow` and `hello` buttons;
-/// `grand`, the calculated sum of the amounts.
 /// A hidden subform `details` a script may show, holding a named field and three unnamed
 /// objects: a caption, an old caption the form keeps hidden, and a hidden subform. Unnamed
 /// objects have no SOM name of their own, so showing `details` must leave the hidden ones hidden.
@@ -142,6 +138,10 @@ pub fn unnamed_hidden_template() -> String {
     .to_string()
 }
 
+/// A scripted form (JavaScript events): `qty` (initialised to 2, validated ≤ 100) × `price`
+/// (5) = `total` (calculated); a check box `more` that shows the hidden `details` subform;
+/// a table whose `row` (item, amount) repeats, with `addRow`, `removeRow` and `hello` buttons;
+/// `grand`, the calculated sum of the amounts.
 pub fn scripted_template() -> String {
     r##"<?xml version="1.0" encoding="UTF-8"?>
 <xdp:xdp xmlns:xdp="http://ns.adobe.com/xdp/">
diff --git a/crates/xfa/src/script.rs b/crates/xfa/src/script.rs
index df7ba2fdf..1d0dc8a86 100644
--- a/crates/xfa/src/script.rs
+++ b/crates/xfa/src/script.rs
@@ -237,6 +237,9 @@ impl Walker<'_> {
         self.ov.access.get(som).cloned().unwrap_or_else(|| access_name(a).to_string())
     }
 
+    /// The live node of field `f`, child `index` of `parent_som`, with its scripts recorded. In an
+    /// exclusion group (`radio` is the group's selected value) its value is its on value when picked,
+    /// else empty; elsewhere it is its data value (as saved) or its template default.
     fn field(&mut self, f: &Field, parent_som: &str, index: usize, radio: Option<&str>) -> FormNode {
         let som = child_som(parent_som, f.common.name.as_deref().or(Some("field")), index);
         let data_value = self.data.and_then(|d| d.value_at(&data_path(self.tpl, &som))).map(|t| t.trim().to_string()).filter(|t| !t.is_empty());
@@ -276,6 +279,9 @@ impl Walker<'_> {
         }
     }
 
+    /// The live nodes of `nodes`, the children of `parent_som`, with their scripts recorded: one per
+    /// instance of a repeating subform (what the data holds, else its initial count). Nothing past
+    /// [`MAX_DEPTH`] is built, and building stops once the object budget is spent.
     fn children(&mut self, nodes: &[Node], parent_som: &str, depth: usize) -> Vec<FormNode> {
         let mut out = Vec::new();
         if depth > MAX_DEPTH {
@@ -445,6 +451,9 @@ pub fn has_scripts(tpl: &Template) -> bool {
 /// The template with `ov` applied to its objects (instance 0 of each; scripts that hide one
 /// instance of a repeating subform hide them all).
 pub fn apply_overrides(tpl: &Template, ov: &Overrides) -> Template {
+    /// Set the presence `ov` gives each of `nodes` (children of `parent_som`) and their descendants,
+    /// down to [`MAX_DEPTH`], and the access it gives a field outside an exclusion group. An unnamed
+    /// draw, area or subform shares its parent's SOM path, so it takes no override of its own.
     fn walk(nodes: &mut [Node], parent_som: &str, ov: &Overrides, depth: usize) {
         if depth > MAX_DEPTH {
             return;
diff --git a/crates/xfa/src/tests.rs b/crates/xfa/src/tests.rs
index d1503527c..ab49e26bf 100644
--- a/crates/xfa/src/tests.rs
+++ b/crates/xfa/src/tests.rs
@@ -716,6 +716,9 @@ fn overrides_live_in_the_acroform_and_hide_objects_in_the_layout() {
     assert!(overrides(&doc).is_empty());
 }
 
+/// Showing a hidden subform through an override leaves its unnamed hidden draw and subform hidden,
+/// in the layout and in the live form scripts see: they share the subform's SOM path, so its
+/// override is not theirs.
 #[test]
 fn showing_a_subform_leaves_its_unnamed_hidden_objects_hidden() {
     let (tpl, _) = parse(&unnamed_hidden_template()).unwrap();