`-4` is better

diff --git a/tools/tcpdrop_example.txt b/tools/tcpdrop_example.txt
index 2adbb6c0eab3565522e19129786e6d99cedbc1c6..641c876612226db52d925de1f20c66d529064435 100644 (file)
--- a/tools/tcpdrop_example.txt
+++ b/tools/tcpdrop_example.txt
@@ -61,7 +61,7 @@ remote end to do timer-based retransmits, hurting performance.
 USAGE:
 
 # ./tcpdrop.py -h
-usage: tcpdrop.py [4 | -6] [-h]
+usage: tcpdrop.py [-4 | -6] [-h]
 
 Trace TCP drops by the kernel