1 files changed, 8 insertions, 4 deletions

diff --git a/include/usage.h b/include/usage.h
index 00cbe5608..4401a763a 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -2106,11 +2106,15 @@
         "Options:\n" \
         "\t-n\t\tsuppress automatic printing of pattern space\n" \
         "\t-e script\tadd the script to the commands to be executed\n" \
-        "\t-f scriptfile\tadd the contents of script-file to the commands to be executed\n" \
+        "\t-f scriptfile\tadd script-file contents to the\n" \
+            "\t\t\tcommands to be executed\n" \
+        "\t-i\t\tEdit files in-place\n" \
         "\n" \
-        "If no -e or -f is given, the first non-option argument is taken as the\n" \
-        "sed script to interpret. All remaining arguments are names of input\n" \
-        "files; if no input files are specified, then the standard input is read."
+        "If no -e or -f is given, the first non-option argument is taken as the sed\n"\
+        "script to interpret. All remaining arguments are names of input files; if no\n"\
+        "input files are specified, then the standard input is read.  Source files\n" \
+        "will not be modified unless -i option is given."
+
 #define sed_example_usage \
         "$ echo "foo" | sed -e 's/f[a-zA-Z]o/bar/g'\n" \
         "bar\n"