Update service.rb

activestorage/lib/active_storage/service.rb

@@ -90,7 +90,7 @@ def exist?(key)
     end
 
     # Returns a signed, temporary URL for the file at the +key+. The URL will be valid for the amount
-    # of seconds specified in +expires_in+. You most also provide the +disposition+ (+:inline+ or +:attachment+),
+    # of seconds specified in +expires_in+. You must also provide the +disposition+ (+:inline+ or +:attachment+),
     # +filename+, and +content_type+ that you wish the file to be served with on request.
     def url(key, expires_in:, disposition:, filename:, content_type:)
       raise NotImplementedError