diff --git a/1989/ovdluhe/README.md b/1989/ovdluhe/README.md
index 2e402d284..0d110e5ae 100644
--- a/1989/ovdluhe/README.md
+++ b/1989/ovdluhe/README.md
@@ -19,6 +19,9 @@ Judges notes:
 	The program stops when it reaches the end of the template buffer 
 	by chance or is killed.
 
+	To have a chance to compile under a modern CPP, we had to
+	replace `#D` with `#define`.
+
 Selected notes from the author:
 
 	This program implements an "Eddington ape" - it generates