diff --git a/SnpSift/SnpSift_extract.cwl b/SnpSift/SnpSift_extract.cwl
new file mode 100644
index 00000000..b8cd75db
--- /dev/null
+++ b/SnpSift/SnpSift_extract.cwl
@@ -0,0 +1,47 @@
+class: CommandLineTool
+cwlVersion: v1.0
+
+hints:
+  - class: DockerRequirement
+    dockerPull: quay.io/biocontainers/snpsift:4.3.1t--2
+    
+doc:   "SnpSift Extract Fields <http://snpeff.sourceforge.net/SnpSift.html#Extract> selects columns from a VCF dataset into a Tab-delimited format."
+
+stdout: $(inputs.input_vcf.nameroot).tsv
+baseCommand: [SnpSift, -Xmx6G, extractFields]
+arguments: 
+  - valueFrom: \"$(inputs.empty_text)\"
+    prefix: -e
+    position: 4
+inputs:
+  - id: input_vcf
+    type: File 
+    inputBinding:
+      position: 1
+
+  - id: extractFields
+    type: string[]?
+    default: "CHROM POS ID REF ALT FILTER"
+    doc: "Separated by spaces"
+    inputBinding:
+      position: 2
+      
+  - id: separator
+    type: string?
+    doc: "Separate multiple fields in one column with this character, e.g. a comma, rather than a column for each of the multiple values"
+    inputBinding:
+      prefix: -s
+      position: 3
+      
+  - id: empty_text
+    type: string?
+    doc: "Represent empty fields with this value, rather than leaving them blank"
+   # inputBinding:
+   #   prefix: -e
+   #   position: 4
+
+outputs: 
+  - id: out
+    type: stdout
+requirements:
+  - class: InlineJavascriptRequirement