diff --git a/CHANGELOG.md b/CHANGELOG.md
index b391a2d..580bb30 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,10 @@
 One line per change, grouped by the release that shipped it. Newest
 first. Each release names the portal tag it is built against.
 
+## Unreleased
+
+- `needs.yaml` may name the site's `tones`, one storyline each; the checks read the first storyline, which is what `build_questions` gives.
+
 ## 0.5.10 (2026-09-30) - portal v0.5.10
 
 - Matches portal v0.5.10 (released by portal's publish job).
diff --git a/src/needs.rs b/src/needs.rs
index 032882b..d3354d8 100644
--- a/src/needs.rs
+++ b/src/needs.rs
@@ -36,6 +36,11 @@ pub struct NeedsFile {
     pub needs: Vec<Need>,
     #[serde(default)]
     pub personas: Vec<Persona>,
+    /// The tones of voice the site is told in, one storyline each
+    /// (portal docs, Storylines). Named here so the report can say
+    /// which tone a storyline index is; the checks read the first.
+    #[serde(default)]
+    pub tones: Vec<String>,
 }
 
 #[derive(Debug, Deserialize)]