diff --git a/README.md b/README.md
index 0099704..b5c076c 100644
--- a/README.md
+++ b/README.md
@@ -161,7 +161,8 @@ a breadcrumb trail, a hidden-entries toggle — driven through
 stored in the form that keeps its meaning: `/work/root/src/shared` becomes
 `src/shared` when the session started in `/work/root`. The picker's own path field
 stays editable, because the Host lists folders and an extra may legitimately name
-a file.
+a file — which is why that action reads **Add path or file** and its field **Path
+or file**, rather than promising a folder the list would then fail to show.
 
 Because the panel owns widening, `facet action=add` is the *other* path and the
 narrower one: it is gated on an approval channel, and a deployment with none — the
diff --git a/client/client.js b/client/client.js
index 7171f0c..149d312 100644
--- a/client/client.js
+++ b/client/client.js
@@ -680,7 +680,7 @@ window.__ModuleLoader__.load({
       return h(Modal, {
         open: true,
         onClose,
-        title: target === 'focus' ? 'Choose the focus folder' : 'Add a folder or a path',
+        title: target === 'focus' ? 'Choose the focus folder' : 'Add a path or a file',
         closeLabel: 'Close',
         className: PICKER_CLASS,
         // One scroll region around everything but the footer, so the card is
@@ -694,7 +694,7 @@ window.__ModuleLoader__.load({
           h(
             'div',
             { key: 'path' },
-            h('label', { style: labelStyle, htmlFor: 'facet-picker-path' }, target === 'focus' ? 'Folder' : 'Path'),
+            h('label', { style: labelStyle, htmlFor: 'facet-picker-path' }, target === 'focus' ? 'Folder' : 'Path or file'),
             h('input', {
               id: 'facet-picker-path',
               type: 'text',
@@ -713,7 +713,16 @@ window.__ModuleLoader__.load({
                 model.open(typed)
               },
             }),
-            h('p', { style: hintStyle }, 'Relative to the session folder, or absolute. Enter lists whatever is there.'),
+            h(
+              'p',
+              { style: hintStyle },
+              target === 'focus'
+                ? 'Relative to the session folder, or absolute. Enter lists whatever is there.'
+                : // The list holds folders only — the Host's browse primitive has no
+                  // file rows — so the box is where a file is named, and saying so
+                  // is the difference between a dead end and an instruction.
+                  'Relative to the session folder, or absolute. The list holds folders; type a file\u2019s name to add the file itself.',
+            ),
           ),
           h(
             'div',
@@ -1015,7 +1024,7 @@ window.__ModuleLoader__.load({
                 h(
                   'button',
                   { type: 'button', style: quietButtonStyle, disabled: !canBrowse, onClick: () => openPicker('extra') },
-                  '+ Add folder or path\u2026',
+                  '+ Add path or file\u2026',
                 ),
               ),
               h(
diff --git a/test/client.test.js b/test/client.test.js
index 4827694..183c0db 100644
--- a/test/client.test.js
+++ b/test/client.test.js
@@ -423,7 +423,7 @@ test('the panel renders the scope, the guidance, and a way to add and remove', a
   // already did.
   assert.ok(buttons.some((button) => labelOf(button) === 'Browse\u2026'))
   assert.ok(buttons.some((button) => labelOf(button) === 'Clear'))
-  assert.ok(buttons.some((button) => labelOf(button) === '+ Add folder or path\u2026'))
+  assert.ok(buttons.some((button) => labelOf(button) === '+ Add path or file\u2026'))
   assert.ok(!buttons.some((button) => labelOf(button) === 'Set'))
   assert.deepEqual(inputs, [], 'the panel itself has no free-text box left')
 })
@@ -456,7 +456,7 @@ test('a deployment with no directory browser keeps the panel and says so', async
   )
   assert.deepEqual(
     buttonsOf(tree)
-      .filter((button) => label(button) === '+ Add folder or path\u2026')
+      .filter((button) => label(button) === '+ Add path or file\u2026')
       .map((button) => button.props.disabled),
     [true],
   )
@@ -520,7 +520,10 @@ function walkTree(node, visit) {
   }
   visit(node)
   if (Array.isArray(node.children)) node.children.forEach((child) => walkTree(child, visit))
+  // `footer` is a prop rather than a child, and it is rendered: a control there
+  // is as much part of the tree as one in the body.
   walkTree(node.props?.children, visit)
+  walkTree(node.props?.footer, visit)
 }
 
 test('a path is declared relative to the session folder wherever it can be', async () => {
@@ -661,3 +664,37 @@ test('the picker lists folders, hides hidden ones until asked, and answers in de
   await settle()
 })
 
+test('the extras picker names what it accepts and says what the list holds', async () => {
+  const { module: mod } = await loadClient()
+
+  const model = new mod.DirectoryPickerModel({
+    list: () => Promise.resolve(listingFixture()),
+    root: '/work/root',
+    start: '/work/root/src',
+  })
+  await settle()
+
+  const tree = mod.DirectoryPicker({
+    model,
+    root: '/work/root',
+    target: 'extra',
+    disabled: false,
+    onClose: () => {},
+    onPick: () => {},
+  })
+
+  // "folder or path" promised one thing and offered another: the rows are
+  // folders, and a file is added by naming it. The copy says both.
+  assert.equal(tree.props.title, 'Add a path or a file')
+  const texts = textsOf(tree)
+  assert.ok(texts.includes('Path or file'), 'the field is named for what it accepts')
+  assert.ok(
+    texts.some((text) => text.includes('The list holds folders')),
+    'the copy explains why no file rows are shown',
+  )
+  assert.ok(
+    buttonsOf(tree).some((button) => (button.children ?? [])[0] === 'Add'),
+    'the action is Add for an extra, not Set focus',
+  )
+})
+