diff --git a/src/lib/FileViewer.svelte b/src/lib/FileViewer.svelte
index bf1063a..31050d4 100644
--- a/src/lib/FileViewer.svelte
+++ b/src/lib/FileViewer.svelte
@@ -54,7 +54,7 @@
   <p>
     Max file size is <strong>{fileRequirements.maxSize / 1000}kb</strong>.
     Accepted formats:
-    <strong>{fileRequirements.supportedFormats.join(",")}</strong>.
+    <strong>{fileRequirements.supportedFormats.join(", ")}</strong>.
   </p>
 
   <Dropzone