diff --git a/modules/bamtools/split/meta.yml b/modules/bamtools/split/meta.yml
index 0fd5d5ca..badc6974 100644
--- a/modules/bamtools/split/meta.yml
+++ b/modules/bamtools/split/meta.yml
@@ -23,7 +23,7 @@ input:
         e.g. [ id:'test', single_end:false ]
   - bam:
       type: file
-      description: A list of BAM files to merge and then split
+      description: A list of one or more BAM files to merge and then split
       pattern: "*.bam"
   - bam_list:
       type: file