diff --git a/nmap.cc b/nmap.cc
index 4967f09a1..f3b83a6e0 100644
--- a/nmap.cc
+++ b/nmap.cc
@@ -286,7 +286,6 @@ printf("%s %s ( %s )\n"
        "  --ttl <val>: Set IP time-to-live field\n"
        "  --spoof-mac <mac address/prefix/vendor name>: Spoof your MAC address\n"
        "  --badsum: Send packets with a bogus TCP/UDP/SCTP checksum\n"
-       "  --adler32: Use deprecated Adler32 instead of CRC32C for SCTP checksums\n"
        "OUTPUT:\n"
        "  -oN/-oX/-oS/-oG <file>: Output scan in normal, XML, s|<rIpt kIddi3,\n"
        "     and Grepable format, respectively, to the given filename.\n"