diff --git a/src/App.jsx b/src/App.jsx
index 8262826..200c47b 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -324,7 +324,7 @@ const PlotSection = ({ lensCurves, plotType, setPlotType, previewDistanceMeters
       <div className="flex flex-wrap items-center justify-between gap-3">
         <div>
           <h2 className="text-lg font-semibold text-slate-100">Blur comparison</h2>
-          <p className="text-xs uppercase tracking-wide text-slate-400">Blur radius as % of sensor diagonal</p>
+          <p className="text-xs uppercase tracking-wide text-slate-400">Blur diameter as % of sensor diagonal</p>
         </div>
         <div className="flex flex-wrap items-center gap-3">
           <select
@@ -358,7 +358,7 @@ const PlotSection = ({ lensCurves, plotType, setPlotType, previewDistanceMeters
                 ...(axisConfig.ticksuffix ? { ticksuffix: axisConfig.ticksuffix } : {}),
               },
               yaxis: {
-                title: 'Blur radius (% of sensor diagonal)',
+                title: 'Blur diameter (% of sensor diagonal)',
                 type: 'linear',
                 gridcolor: 'rgba(148, 163, 184, 0.2)',
                 zerolinecolor: 'rgba(148, 163, 184, 0.4)',
@@ -979,7 +979,7 @@ const App = () => {
           <div>
             <h1 className="text-2xl font-semibold text-slate-100">Lens & Sensor Blur Comparison</h1>
             <p className="text-sm text-slate-400">
-              Explore blur radius as % of sensor diagonal across lens and sensor combinations.
+              Explore blur diameter as % of sensor diagonal across lens and sensor combinations.
             </p>
           </div>
         </div>