diff --git a/astrocyte_pkg.yml b/astrocyte_pkg.yml
index fb2cd5eb47c4383338a9c307260472386b5028fc..71ca9772f4db02a1b11dbcc1e93b113ad4810e5a 100644
--- a/astrocyte_pkg.yml
+++ b/astrocyte_pkg.yml
@@ -81,12 +81,15 @@ workflow_parameters:
     required: true
     description: |
       Bam files of all samples
+    regex: ".*(bam|BAM)"
 
   - id: peaks
     type: files
     required: true
     description: |
       Peak files of all samples. Peaks should be sorted. Bed format
+    regex: ".*(narrowPeak|broadPeak|bed|BED)"
+
 
   - id: design
     type: files