diff --git a/README.md b/README.md
index 7d360654..6a4aa3df 100644
--- a/README.md
+++ b/README.md
@@ -481,7 +481,7 @@ See *KEY BINDINGS* section of the man page for details.
 
 When `--preview` option is set, fzf automatically starts an external process with
 the current line as the argument and shows the result in the split window. Your
-`$SHELL` is used to execute the command with `$SHELL -c COMMAND`
+`$SHELL` is used to execute the command with `$SHELL -c COMMAND`.
 
 ```bash
 # {} is replaced to the single-quoted string of the focused line