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-rw-r--r--src/window_type.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/window_type.h b/src/window_type.h
index 00af022da..1a078b217 100644
--- a/src/window_type.h
+++ b/src/window_type.h
@@ -111,6 +111,7 @@ enum WindowClass {
WC_INDUSTRY_CARGOES,
WC_GRF_PARAMETERS,
WC_BUILD_OBJECT,
+ WC_NEWGRF_README,
WC_INVALID = 0xFFFF
};