diff --git a/README.md b/README.md
index ec644b4..52786fd 100644
--- a/README.md
+++ b/README.md
@@ -72,6 +72,7 @@ Usage
 usage: fzf [options]
 
   -m, --multi      Enable multi-select
+  -x, --extended   Extended-search mode
   -s, --sort=MAX   Maximum number of matched items to sort. Default: 500
   +s, --no-sort    Do not sort the result. Keep the sequence unchanged.
   +i               Case-sensitive match
diff --git a/fzf b/fzf
index e097541..5c3c47f 100755
--- a/fzf
+++ b/fzf
@@ -110,7 +110,7 @@ class FZF
     $stderr.puts %[usage: fzf [options]
 
     -m, --multi      Enable multi-select
-    -x, --extended   Extended mode
+    -x, --extended   Extended-search mode
     -s, --sort=MAX   Maximum number of matched items to sort. Default: 500.
     +s, --no-sort    Do not sort the result. Keep the sequence unchanged.
     +i               Case-sensitive match