diff --git a/browser/src/GenePage/MitochondrialRegionConstraintTrack.tsx b/browser/src/GenePage/MitochondrialRegionConstraintTrack.tsx
index 70e57502d..540ef51f9 100644
--- a/browser/src/GenePage/MitochondrialRegionConstraintTrack.tsx
+++ b/browser/src/GenePage/MitochondrialRegionConstraintTrack.tsx
@@ -20,7 +20,7 @@ const constraintColor = '#fd8d3c'
 
 const Legend = () => (
   <>
-    <span>Constrained region</span>
+    <span>Regionally constrained interval</span>
     <svg width={50} height={25}>
       <rect x={10} y={3} width={30} height={10} stroke="#000" fill={constraintColor} />
     </svg>
diff --git a/browser/src/GenePage/__snapshots__/MitochondrialRegionConstraintTrack.spec.tsx.snap b/browser/src/GenePage/__snapshots__/MitochondrialRegionConstraintTrack.spec.tsx.snap
index 974a788e7..1a4ac03cf 100644
--- a/browser/src/GenePage/__snapshots__/MitochondrialRegionConstraintTrack.spec.tsx.snap
+++ b/browser/src/GenePage/__snapshots__/MitochondrialRegionConstraintTrack.spec.tsx.snap
@@ -69,7 +69,7 @@ exports[`MitochondrialRegionConstraintTrack for a protein gene track has no unex
             className="ConstraintTrack__LegendWrapper-sc-113yvfg-4 kkHtue"
           >
             <span>
-              Constrained region
+              Regionally constrained interval
             </span>
             <svg
               height={25}
@@ -204,7 +204,7 @@ exports[`MitochondrialRegionConstraintTrack for an RNA gene track has no unexpec
             className="ConstraintTrack__LegendWrapper-sc-113yvfg-4 kkHtue"
           >
             <span>
-              Constrained region
+              Regionally constrained interval
             </span>
             <svg
               height={25}