doc: mention how to avoid newlines impacting ls -1

* src/ls.c (usage): Mention the -b and -q options
in the -1 description.
* doc/coreutils.texi (ls invocation): Likewise.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/ls.c b/src/ls.c
index 8b5b2cf74..5bae06fbe 100644
--- a/src/ls.c
+++ b/src/ls.c
@@ -4929,7 +4929,8 @@ Sort entries alphabetically if none of -cftuvSUX nor --sort is specified.\n\
   -x                         list entries by lines instead of by columns\n\
   -X                         sort alphabetically by entry extension\n\
   -Z, --context              print any security context of each file\n\
-  -1                         list one file per line\n\
+  -1                         list one file per line.  Avoid '\\n' with -q or -b\
+\n\
 "), stdout);
       fputs (HELP_OPTION_DESCRIPTION, stdout);
       fputs (VERSION_OPTION_DESCRIPTION, stdout);