diff --git a/ex-5_50-52.scm b/ex-5_50-52.scm
index 3eb0f97..06aa96a 100644
--- a/ex-5_50-52.scm
+++ b/ex-5_50-52.scm
@@ -84,5 +84,13 @@
 
 (display "\nex-5.51\n")
 
-;(display "\nex-5.52\n")
+; I have implemented a crude Scheme interpreter in Rust:
+; https://git.felixm.de/felixm/schemers
+
+(display "[ok]\n")
+
+(display "\nex-5.52\n")
+
+; YAS, almost done!
+(display "TBD!!!\n")