diff --git a/docs/CREDITS-MANUAL b/docs/CREDITS-MANUAL
index 71645e9139..d9d2350d2c 100644
--- a/docs/CREDITS-MANUAL
+++ b/docs/CREDITS-MANUAL
@@ -28,3 +28,6 @@ Alexander Levin
 Piotr Jafiszow
 Tom Ross
 Philippe Latulippe
+Costas Calamvokis
+Peter Harley
+