diff --git a/README.md b/README.md
index 2426c58..0a61d88 100644
--- a/README.md
+++ b/README.md
@@ -119,8 +119,8 @@ The mouse works too: click to select, click `▸` to toggle, wheel to move.
 
 ## Status
 
-A prototype. Browsing is complete; the actions `u` (check out the pin) and `b` (bump the pin to the tip) are
-planned.
+A prototype. Browsing is complete and read-only; write actions (restore,
+stage pin) are being specified in [docs/actions.md](docs/actions.md).
 
 ## Documentation
 
diff --git a/docs/README.md b/docs/README.md
index ae4e1d3..5db1b93 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -33,10 +33,10 @@ Installs `submarine` and the alias `sub` (linux/macOS, amd64/arm64) to
 through a git provider (`internal/submodule/git`): `submarine [dir]`. It
 fetches only when asked (`f`) and follows changes made in other shells. `submarine --mock` shows
 the built-in mock data (`internal/submodule/mock`). `!` shows only
-submodules with problems. The actions `u` and `b` only show a "not
-implemented" message ([drafts of the write actions](actions.md)).
+submodules with problems. It is read-only so far; the first write actions
+are [drafted](actions.md).
 
 Next steps, roughly in order:
 
-1. Actions: checkout pin (`submodule update`), bump pin to tip, init.
+1. Write actions: restore and stage pin, see [actions.md](actions.md).
 2. (done) "Problems only" (`!`) view, reusing the tree's filter.
diff --git a/docs/requirements.md b/docs/requirements.md
index 7742365..284ebb2 100644
--- a/docs/requirements.md
+++ b/docs/requirements.md
@@ -89,7 +89,7 @@ commit hashes. It doesn't answer the questions users actually have:
   severe first), staged pins, how many are still loading, and the time since
   the last fetch.
 - **F31** The footer shows key hints; `?` toggles the full help. It
-  temporarily shows short messages (e.g. "not implemented").
+  temporarily shows short messages (e.g. "copied <path>").
 
 ### Navigation
 
@@ -128,14 +128,10 @@ commit hashes. It doesn't answer the questions users actually have:
   list is not mistaken for a healthy repository. See
   [Problems only](ux-guide.md#problems-only).
 
-### Actions (planned, not implemented)
+### Actions (planned)
 
-| Key | Action |
-|---|---|
-| `u` | Check out the pinned commit (`git submodule update`) |
-| `b` | Bump the pin to the tip of its ref |
-
-See [actions.md](actions.md) for the draft of the write actions.
+The tool is read-only so far. The first write actions, restore and stage
+pin, are drafted in [actions.md](actions.md).
 
 ## Usage
 
diff --git a/docs/ux-guide.md b/docs/ux-guide.md
index 576d48b..a9a232c 100644
--- a/docs/ux-guide.md
+++ b/docs/ux-guide.md
@@ -221,7 +221,6 @@ colors in components.
 | `c` | Copy the absolute directory of the selected submodule to the clipboard (OSC 52, so it also works over SSH; needs terminal support, in tmux `set -g set-clipboard on`). The footer confirms with `copied <path>`. Without a local provider (mock) the path relative to the superproject is copied |
 | `/` | Open the filter, see [Filter](#filter) |
 | `!` | Toggle problems only, see [Problems only](#problems-only) |
-| `u`, `b` | Planned actions (see requirements) |
 
 "First child" always means the first child **as displayed** (children are
 grouped by directory).
@@ -276,29 +275,27 @@ the term*.
 
 ### Key reference
 
-Every key in the UI, where it is shown, and whether it works. Update this
-table when a key is added, moved or implemented. "Bar" is the short footer
+Every key in the UI, where it is shown. Update this
+table when a key is added or moved. "Bar" is the short footer
 bar, "Palette" the detail pane's palette (the footer takes its keys over
 where the palette can't be shown, see [Key bar and palette](#key-bar-and-palette)),
 "Help" the full help (`?`).
 
-| Key | Action | Group | Shown in | Implemented |
-|---|---|---|---|---|
-| `↑` / `k`, `↓` / `j` | Move selection | Navigation | Bar, Help | yes |
-| `←` / `h`, `→` / `l` | Fold / unfold, parent / first child | Navigation | Bar, Help | yes |
-| `H` / `⇧←`, `L` / `⇧→` | Collapse / expand all | Navigation | Bar, Help | yes |
-| `space` | Toggle expand/collapse | Navigation | Bar, Help | yes |
-| `home` / `g`, `end` / `G` | Header / last submodule | Navigation | Help | yes |
-| `pgup`, `pgdn` | Move by one screen | Navigation | Help | yes |
-| `c` | Copy path | Submodule | Palette, Help | yes |
-| `u` | Checkout pin | Submodule | Help | no (flashes "not implemented") |
-| `b` | Bump pin to tip | Submodule | Help | no (flashes "not implemented") |
-| `f` | Fetch all repositories | Global | Help | yes |
-| `r` | Reload everything | Global | Help | yes |
-| `/` | Filter | Global | Help | yes |
-| `!` | Problems only (toggle) | Global | Help | yes |
-| `?` | Toggle full help | Global | Bar, Help | yes |
-| `q`, `ctrl+c` | Quit | Global | Bar, Help | yes |
+| Key | Action | Group | Shown in |
+|---|---|---|---|
+| `↑` / `k`, `↓` / `j` | Move selection | Navigation | Bar, Help |
+| `←` / `h`, `→` / `l` | Fold / unfold, parent / first child | Navigation | Bar, Help |
+| `H` / `⇧←`, `L` / `⇧→` | Collapse / expand all | Navigation | Bar, Help |
+| `space` | Toggle expand/collapse | Navigation | Bar, Help |
+| `home` / `g`, `end` / `G` | Header / last submodule | Navigation | Help |
+| `pgup`, `pgdn` | Move by one screen | Navigation | Help |
+| `c` | Copy path | Submodule | Palette, Help |
+| `f` | Fetch all repositories | Global | Help |
+| `r` | Reload everything | Global | Help |
+| `/` | Filter | Global | Help |
+| `!` | Problems only (toggle) | Global | Help |
+| `?` | Toggle full help | Global | Bar, Help |
+| `q`, `ctrl+c` | Quit | Global | Bar, Help |
 
 ### Mouse
 
diff --git a/internal/tui/app.go b/internal/tui/app.go
index 22d5339..d5e1d7a 100644
--- a/internal/tui/app.go
+++ b/internal/tui/app.go
@@ -380,10 +380,6 @@ func (m Model) handleKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 	case key.Matches(msg, k.Issues):
 		m.tree.SetProblemsOnly(!m.tree.ProblemsOnly())
 		m.layout()
-	case key.Matches(msg, k.Update, k.Bump):
-		cmd := m.footer.Flash("“" + msg.String() + "” is not implemented in the prototype")
-		m.layout()
-		return m, cmd
 	}
 	return m, nil
 }
diff --git a/internal/tui/keys.go b/internal/tui/keys.go
index 615e696..dc7e104 100644
--- a/internal/tui/keys.go
+++ b/internal/tui/keys.go
@@ -3,11 +3,11 @@ package tui
 import "github.com/charmbracelet/bubbles/key"
 
 type keyMap struct {
-	Up, Down, Left, Right, Toggle               key.Binding
-	CollapseAll, ExpandAll                      key.Binding
-	Home, End, PageUp, PageDown                 key.Binding
-	Update, Bump, Fetch, Reload, Filter, Issues key.Binding
-	Copy, Help, Quit                            key.Binding
+	Up, Down, Left, Right, Toggle key.Binding
+	CollapseAll, ExpandAll        key.Binding
+	Home, End, PageUp, PageDown   key.Binding
+	Fetch, Reload, Filter, Issues key.Binding
+	Copy, Help, Quit              key.Binding
 }
 
 func defaultKeys() keyMap {
@@ -23,8 +23,6 @@ func defaultKeys() keyMap {
 		End:         key.NewBinding(key.WithKeys("end", "G"), key.WithHelp("end/G", "last")),
 		PageUp:      key.NewBinding(key.WithKeys("pgup"), key.WithHelp("pgup", "page up")),
 		PageDown:    key.NewBinding(key.WithKeys("pgdown"), key.WithHelp("pgdn", "page down")),
-		Update:      key.NewBinding(key.WithKeys("u"), key.WithHelp("u", "checkout pin")),
-		Bump:        key.NewBinding(key.WithKeys("b"), key.WithHelp("b", "bump pin to tip")),
 		Fetch:       key.NewBinding(key.WithKeys("f"), key.WithHelp("f", "fetch")),
 		Reload:      key.NewBinding(key.WithKeys("r"), key.WithHelp("r", "reload")),
 		Filter:      key.NewBinding(key.WithKeys("/"), key.WithHelp("/", "filter")),
@@ -59,7 +57,7 @@ func (k keyMap) FullHelp() [][]key.Binding {
 		{k.Up, k.Down, k.Left, k.Right, k.Toggle},
 		{k.CollapseAll, k.ExpandAll},
 		{k.Home, k.End, k.PageUp, k.PageDown},
-		{k.Copy, k.Update, k.Bump},
+		{k.Copy},
 		{k.Fetch, k.Reload, k.Filter, k.Issues},
 		{k.Help, k.Quit},
 	}