diff -r 24dab79dca15 -r 80c8517b08d1 src/newgrf_callbacks.h
--- a/src/newgrf_callbacks.h	Fri Sep 14 22:25:00 2007 +0000
+++ b/src/newgrf_callbacks.h	Fri Sep 14 22:27:40 2007 +0000
@@ -160,7 +160,7 @@
 	CBID_INDUSTRY_SPECIAL_EFFECT         = 0x3B,
 
 	/** Called to determine if industry can alter the ground below industry tile */
-	CBID_INDUSTRY_AUTOSLOPE              = 0x3C, // not implemented
+	CBID_INDUSTRY_AUTOSLOPE              = 0x3C,
 
 	/** Called to determine if the industry can still accept or refuse more cargo arrival */
 	CBID_INDUSTRY_REFUSE_CARGO           = 0x3D,