diff --git a/web/src/crate_web/route.gleam b/web/src/crate_web/route.gleam
index e3633d3..9343604 100644
--- a/web/src/crate_web/route.gleam
+++ b/web/src/crate_web/route.gleam
@@ -50,8 +50,8 @@ pub fn to_path(route: Route) -> String {
 /// Which bottom-tab section a route belongs to, so drill-downs off a tab
 /// (a record, the scan flow, a pressing) still show that tab active instead
 /// of none. `Add` owns its own section rather than folding into `Crate`, so
-/// the CRATE tab doesn't light up while the visitor is on the add form (the
-/// centre "+" slot has no active rendering of its own yet - see nav.add_tab).
+/// the CRATE tab doesn't light up while the visitor is on the add form; the
+/// centre "+" slot lights up instead, see `nav.add_tab`.
 /// `PublicCrate`/`PublicRecord` map to themselves since they're reached
 /// outside the tab bar entirely.
 pub fn section(route: Route) -> Route {
diff --git a/web/src/crate_web/ui/nav.gleam b/web/src/crate_web/ui/nav.gleam
index 3543c54..4233a5b 100644
--- a/web/src/crate_web/ui/nav.gleam
+++ b/web/src/crate_web/ui/nav.gleam
@@ -62,10 +62,16 @@ fn current_attr(active: Bool) -> List(attr.Attribute(msg)) {
 }
 
 /// The center ADD slot: a square link straight into the scan flow, replacing
-/// the old floating action button.
-pub fn add_tab(href: String) -> Element(msg) {
+/// the old floating action button. Signals active state the same way `tab`
+/// does (an `is-active` class plus `aria-current="page"`, never `"false"`).
+pub fn add_tab(href: String, active: Bool) -> Element(msg) {
   html.a(
-    [attr.class("tab-add"), attr.href(href), attr.aria_label("Add a record")],
+    [
+      attr.class(add_tab_class(active)),
+      attr.href(href),
+      attr.aria_label("Add a record"),
+      ..current_attr(active)
+    ],
     [text("+")],
   )
 }
@@ -77,6 +83,13 @@ fn tab_class(active: Bool) -> String {
   }
 }
 
+fn add_tab_class(active: Bool) -> String {
+  case active {
+    True -> "tab-add is-active"
+    False -> "tab-add"
+  }
+}
+
 fn underline_class(active: Bool) -> String {
   case active {
     True -> "tab__underline is-active"
diff --git a/web/src/crate_web/view.gleam b/web/src/crate_web/view.gleam
index d2b3608..d46b971 100644
--- a/web/src/crate_web/view.gleam
+++ b/web/src/crate_web/view.gleam
@@ -214,7 +214,7 @@ fn bottom_bar(model: Model) -> Element(Msg) {
   nav.bottom_bar([
     nav.tab("CRATE", route.to_path(Crate), section == Crate, 0),
     nav.tab("BROWSE", route.to_path(Browse), section == Browse, 0),
-    nav.add_tab(route.to_path(Scan)),
+    nav.add_tab(route.to_path(Scan), section == Add),
     nav.tab("FEED", route.to_path(Feed), section == Feed, 0),
     nav.tab(
       "YOU",