diff --git a/courses/tspl/2019/tspl2019.md b/courses/tspl/2019/tspl2019.md
index 79b32630..b9ad93cc 100644
--- a/courses/tspl/2019/tspl2019.md
+++ b/courses/tspl/2019/tspl2019.md
@@ -145,6 +145,11 @@ but talk to me if you want to formalise something else.
 
 * Optional project cw6 due 4pm Thursday 28 November (Week 11)
 
+Submit the assignment by running
+``` bash
+submit tspl essay Essay.lagda.md
+```
+
 ## Mock exam
 
 10am-12noon Friday 29 November, AT 5.05 West Lab. An online