diff --git a/app/routes/docs.client.samples.md b/app/routes/docs.client.samples.md
index 3f06466fa..b8d3d42c2 100644
--- a/app/routes/docs.client.samples.md
+++ b/app/routes/docs.client.samples.md
@@ -296,7 +296,7 @@ radius = 2.5
 xyz = hp.ang2vec(ra, dec, lonlat=True)
 
 # Obtain an array of indices for the pixels inside the circle
-ipix_disc = hp.query_disc(nside, xyz, radius)
+ipix_disc = hp.query_disc(nside, xyz, np.deg2rad(radius))
 
 # Sum the probability in all of the matching pixels:
 hpx[ipix_disc].sum()