diff --git a/miscutils/adjtimex.c b/miscutils/adjtimex.c
index a9de0f9aa..209d1d560 100644
--- a/miscutils/adjtimex.c
+++ b/miscutils/adjtimex.c
@@ -22,7 +22,7 @@
 //kbuild:lib-$(CONFIG_ADJTIMEX) += adjtimex.o
 
 //usage:#define adjtimex_trivial_usage
-//usage:       "[-q] [-o OFF] [-f FREQ] [-p TCONST] [-t TICK]"
+//usage:       "[-q] [-o OFS] [-f FREQ] [-p TCONST] [-t TICK]"
 //usage:#define adjtimex_full_usage "\n\n"
 //usage:       "Read or set kernel time variables. See adjtimex(2)\n"
 //usage:     "\n	-q	Quiet"
diff --git a/networking/hostname.c b/networking/hostname.c
index f96daed95..549103485 100644
--- a/networking/hostname.c
+++ b/networking/hostname.c
@@ -29,9 +29,9 @@
 //kbuild: lib-$(CONFIG_DNSDOMAINNAME) += hostname.o
 
 //usage:#define hostname_trivial_usage
-//usage:       "[OPTIONS] [HOSTNAME | -F FILE]"
+//usage:       "[-sidf] [HOSTNAME | -F FILE]"
 //usage:#define hostname_full_usage "\n\n"
-//usage:       "Get or set hostname or DNS domain name\n"
+//usage:       "Show or set hostname or DNS domain name\n"
 //usage:     "\n	-s	Short"
 //usage:     "\n	-i	Addresses for the hostname"
 //usage:     "\n	-d	DNS domain name"
diff --git a/util-linux/hexdump.c b/util-linux/hexdump.c
index 2174c3008..57e7e8db7 100644
--- a/util-linux/hexdump.c
+++ b/util-linux/hexdump.c
@@ -28,7 +28,7 @@
 //kbuild:lib-$(CONFIG_HD) += hexdump.o
 
 //usage:#define hexdump_trivial_usage
-//usage:       "[-bcCdefnosvx] [FILE]..."
+//usage:       "[-bcdoxCv] [-e FMT] [-f FMT_FILE] [-n LEN] [-s OFS] [FILE]..."
 //usage:#define hexdump_full_usage "\n\n"
 //usage:       "Display FILEs (or stdin) in a user specified format\n"
 //usage:     "\n	-b		1-byte octal display"
diff --git a/util-linux/hexdump_xxd.c b/util-linux/hexdump_xxd.c
index d2f4b6ed8..29bbc6633 100644
--- a/util-linux/hexdump_xxd.c
+++ b/util-linux/hexdump_xxd.c
@@ -41,7 +41,7 @@
 //    -u          use upper case hex letters.
 
 //usage:#define xxd_trivial_usage
-//usage:       "[OPTIONS] [FILE]"
+//usage:       "[-pr] [-g N] [-c N] [-n LEN] [-s OFS] [FILE]"
 //usage:#define xxd_full_usage "\n\n"
 //usage:       "Hex dump FILE (or stdin)\n"
 //usage:     "\n	-g N		Bytes per group"
@@ -51,7 +51,6 @@
 //usage:     "\n	-l LENGTH	Show only first LENGTH bytes"
 //usage:     "\n	-s OFFSET	Skip OFFSET bytes"
 //usage:     "\n	-r		Reverse (with -p, assumes no offsets in input)"
-// TODO: implement -r (see hexdump -R)
 
 #include "libbb.h"
 #include "dump.h"