diff --git a/workflow/main.nf b/workflow/main.nf
index ebc9b86a532f38596b37a6dad3eab678f545be9a..9a6c2c99f19df0500302593804e2d43ac1ac7a79 100755
--- a/workflow/main.nf
+++ b/workflow/main.nf
@@ -14,7 +14,10 @@
 // Note - $baseDir is the location of this workflow file main.nf
 params.story = "$baseDir/../test_data/mobydick.txt"
 
-stories = Channel.fromPath(params.story)
+
+// To accept multiple filenames, separated with commas, we use a glob pattern
+// in curly brackets.
+stories = Channel.fromPath( "{" + params.story + ",}" )
 
 process uppercase {