diff --git a/schema/workflow.yaml b/schema/workflow.yaml
index 9f9d1b41..460c698d 100644
--- a/schema/workflow.yaml
+++ b/schema/workflow.yaml
@@ -933,6 +933,10 @@ $defs:
                       description: A list of the arguments, if any, to the shell command as argv
                       items:
                         type: string
+                    directory:
+                      type: string
+                      title: ShellDirectory
+                      description: The working directory, if any, in which to run the shell command.
                     environment:
                       type: object
                       title: ShellEnvironment