diff --git a/CHANGELOG.md b/CHANGELOG.md
index 272499c40629072137c99ac6afaa039e13848727..8a882f09ec640b8efac0ab573841200ff18b7803 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,8 +9,9 @@ This document is user facing. Please word the changes in such a way
 that users understand how the changes affect the new version.
 -->
 
-version 5.0.0-dev
+version 4.1.0-dev
 ---------------------------
++ Added a task for GRIDSS.
 + Add wdl file for pacbio's bam2fastx tool.
 
 version 4.0.0
diff --git a/gridss.wdl b/gridss.wdl
new file mode 100644
index 0000000000000000000000000000000000000000..3d4b7d7399c0ae759b8b5efd99bd0b6908450798
--- /dev/null
+++ b/gridss.wdl
@@ -0,0 +1,81 @@
+version 1.0
+
+# Copyright (c) 2017 Leiden University Medical Center
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import "bwa.wdl" as bwa
+
+task GRIDSS {
+    input {
+        File tumorBam
+        File tumorBai
+        String tumorLabel
+        File? normalBam
+        File? normalBai
+        String? normalLabel
+        BwaIndex reference
+        String outputPrefix = "gridss"
+
+        Int threads = 1
+        String dockerImage = "quay.io/biocontainers/gridss:2.9.4--0"
+    }
+
+    command {
+        set -e
+        mkdir -p "$(dirname ~{outputPrefix})"
+        gridss \
+        --reference ~{reference.fastaFile} \
+        --output ~{outputPrefix}.vcf.gz \
+        --assembly ~{outputPrefix}_assembly.bam \
+        ~{"-t " + threads} \
+        --label ~{normalLabel}~{true="," false="" defined(normalLabel)}~{tumorLabel} \
+        ~{normalBam} \
+        ~{tumorBam}
+        tabix -p vcf ~{outputPrefix}.vcf.gz
+        samtools index ~{outputPrefix}_assembly.bam ~{outputPrefix}_assembly.bai
+    }
+
+    output {
+        File vcf = outputPrefix + ".vcf.gz"
+        File vcfIndex = outputPrefix + ".vcf.gz.tbi"
+        File assembly = outputPrefix + "_assembly.bam"
+        File assemblyIndex = outputPrefix + "_assembly.bai"
+    }
+
+    runtime {
+        cpu: threads
+        memory: "32G"
+        docker: dockerImage
+    }
+
+    parameter_meta {
+        tumorBam: {description: "The input BAM file. This should be the tumor/case sample in case of a paired analysis.", category: "required"}
+        tumorBai: {description: "The index for tumorBam.", category: "required"}
+        tumorLabel: {description: "The name of the (tumor) sample.", category: "required"}
+        normalBam: {description: "The BAM file for the normal/control sample.", category: "advanced"}
+        normalBai: {description: "The index for normalBam.", category: "advanced"}
+        normalLabel: {description: "The name of the normal sample.", category: "advanced"}
+        reference: {description: "A BWA index, this should also include the fasta index file (.fai).", category: "required"}
+        outputPrefix: {description: "The prefix for the output files. This may include parent directories.", category: "common"}
+
+        threads: {description: "The number of the threads to use.", category: "advanced"}
+        dockerImage: {description: "The docker image used for this task. Changing this may result in errors which the developers may choose not to address.", category: "advanced"}
+    }
+}
\ No newline at end of file