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-rw-r--r--rts/RtsFlags.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/rts/RtsFlags.c b/rts/RtsFlags.c
index 7fdf28f8c4..fcc1f49a36 100644
--- a/rts/RtsFlags.c
+++ b/rts/RtsFlags.c
@@ -297,6 +297,9 @@ usage_text[] = {
# ifdef DEBUG
" t add time stamps (only useful with -v)",
# endif
+" a all event classes above",
+" -x disable an event class, for any flag above",
+" the initial enabled event classes are 'sgp'",
#endif
#if !defined(PROFILING)