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-rw-r--r--brightnessctl.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/brightnessctl.c b/brightnessctl.c
index 4f47cd1..3810267 100644
--- a/brightnessctl.c
+++ b/brightnessctl.c
@@ -502,6 +502,12 @@ Operations:\n\
g, get\t\t\tget current brightness of the device.\n\
m, max\t\t\tget maximum brightness of the device.\n\
s, set VALUE\t\t\tset brightness of the device.\n\
+\n\
+Valid values:\n\
+ specific value\t\tExample: 500\n\
+ percentage value\t\tExample: 50%%\n\
+ specific delta\t\tExample: 50-\n\
+ percentage delta\t\tExample: 50%%-\n\
\n");
}