diff --git a/samtools.wdl b/samtools.wdl
index ad94338a37d7e0b526aa1623780c350819241ec3..9e415b0ef6795288b5811504a38c6ea77ea5e36e 100644
--- a/samtools.wdl
+++ b/samtools.wdl
@@ -367,6 +367,7 @@ task Merge {
         threads: {description: "Number of threads to use.", category: "common"}
         force: {description: "Equivalent to samtools merge's `-f` flag.", category: "advanced"}
         timeMinutes: {description: "The maximum amount of time the job will run in minutes.", category: "advanced"}
+        memory: {description: "The amount of memory this job will 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"}
     }