diff --git a/src/misc_gui.cpp b/src/misc_gui.cpp
--- a/src/misc_gui.cpp
+++ b/src/misc_gui.cpp
@@ -410,7 +410,7 @@ static const char * const _credits[] = {
 	"",
 	"Special thanks go out to:",
 	"  Josef Drexler - For his great work on TTDPatch",
-	"  Marcin Grzegorczyk - For describing Transport Tycoon Deluxe internals",
+	"  Marcin Grzegorczyk - Track foundations and for describing TTD internals",
 	"  Petr Baudi\xC5\xA1 (pasky) - Many patches, newGRF support",
 	"  Simon Sasburg (HackyKid) - Many bugfixes he has blessed us with",
 	"  Stefan Mei\xC3\x9Fner (sign_de) - For his work on the console",
@@ -425,7 +425,6 @@ static const char * const _credits[] = {
 	"  George - Canal/Lock graphics \xC2\xA9 2003-2004",
 	"  Andrew Parkhouse (andythenorth) - River graphics",
 	"  David Dallaston (Pikka) - Tram tracks",
-	"  Marcin Grzegorczyk - Foundations for tracks on slopes",
 	"  All Translators - Who made OpenTTD a truly international game",
 	"  Bug Reporters - Without whom OpenTTD would still be full of bugs!",
 	"",