diff --git a/2019/endoh/README.md b/2019/endoh/README.md
index b4ce509d8..43d022325 100644
--- a/2019/endoh/README.md
+++ b/2019/endoh/README.md
@@ -4,6 +4,9 @@
 make
 ```
 
+NOTE: we FORCE disable the optimiser and FORCE enable `-g` as this is a
+BACKTRACE QUINE and NEEDS debugging symbols.
+
 
 ### Bugs and (Mis)features: