diff --git a/crates/weksa/src/store.rs b/crates/weksa/src/store.rs
index 9c95e70..e942a66 100644
--- a/crates/weksa/src/store.rs
+++ b/crates/weksa/src/store.rs
@@ -490,13 +490,13 @@ pub(crate) fn normalized(text: &str) -> String {
 }
 
 /// The one-to-one folds `normalized` adds to NFKC and case folding, applied
-/// before the case fold (U+0130 would otherwise fold to i plus a combining dot,
-/// which the key keeps as a mark).
+/// before the case fold. (U+0130 needs no arm: it folds to i plus a combining
+/// dot, and the `dotless` loop in `normalized` drops that dot after an `i`, so
+/// the key is plain `i`.)
 fn fold_variant(c: char) -> impl Iterator<Item = char> {
     let one = |c: char| (c, None);
     let (first, second) = match c {
         '\u{131}' => one('i'),
-        '\u{130}' => one('I'),
         // Voiced katakana wa, wi, we, wo: the hiragana (U+308F-3092) plus the
         // combining voiced mark, which is how NFKC spells the hiragana forms.
         '\u{30f7}'..='\u{30fa}' => (
diff --git a/crates/weksa/tests/mutants_b.rs b/crates/weksa/tests/mutants_b.rs
index 9d932e3..89830a6 100644
--- a/crates/weksa/tests/mutants_b.rs
+++ b/crates/weksa/tests/mutants_b.rs
@@ -78,7 +78,7 @@ fn a_pronunciation_keeps_at_most_eight_rejected_variants() {
 }
 
 #[test]
-fn an_ontology_entry_read_at_an_unknown_revision_is_refused_once_per_condition() {
+fn an_ontology_entry_read_at_an_unknown_revision_is_refused_with_one_refusal() {
     let w = world();
     let mut onto = OntologyStore::open(&w.dir.path().join("o2.cc")).unwrap();
     let entry = OntologyEntry {
@@ -292,5 +292,6 @@ fn relower_refuses_malformed_arm_and_floor_labels_before_reading_the_run() {
     }
     // Well-formed, distinct labels get past the label check (to the missing run).
     let o = relower("a", &["b", "c"]);
-    assert!(!out(&o).contains("arm and floor labels"), "{}", out(&o));
+    assert!(!o.status.success());
+    assert!(out(&o).contains("the root holds no run"), "{}", out(&o));
 }