diff --git a/photo.hbs b/photo.hbs
index b6822a2..7173059 100644
--- a/photo.hbs
+++ b/photo.hbs
@@ -16,7 +16,7 @@
       <p>{{ exif.datetime }}</p>
       <p>
         exposure time <strong>{{ exif.ExposureTime.num }}⁄{{ exif.ExposureTime.denom }}</strong> s<br>
-        aperture <strong>f{{ exif.FNumber.f64 }}</strong><br>
+        aperture <strong>f/{{ exif.FNumber.f64 }}</strong><br>
         iso <strong>{{ exif.PhotographicSensitivity }}</strong><br>
         resolution <strong>{{ exif.PixelXDimension }}×{{ exif.PixelYDimension }}</strong>
       </p>