grep: add support for -r

1 files changed, 2 insertions, 1 deletions

diff --git a/include/usage.h b/include/usage.h
index b119c55c1..320294c8a 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -992,7 +992,7 @@ USE_FEATURE_DATE_ISOFMT( \
         "\t-H login_host\tLog login_host into the utmp file as the hostname"
 
 #define grep_trivial_usage \
-        "[-ihHnqvso" \
+        "[-rihHnqvso" \
         USE_FEATURE_GREP_EGREP_ALIAS("E") \
         USE_FEATURE_GREP_CONTEXT("ABC") \
         "] PATTERN [FILEs...]"
@@ -1001,6 +1001,7 @@ USE_FEATURE_DATE_ISOFMT( \
         "Options:\n" \
         "\t-H\tprefix output lines with filename where match was found\n" \
         "\t-h\tsuppress the prefixing filename on output\n" \
+        "\t-r\trecurse subdirectories\n" \
         "\t-i\tignore case distinctions\n" \
         "\t-l\tlist names of files that match\n" \
         "\t-L\tlist names of files that do not match\n" \