diff --git a/.gitignore b/.gitignore
index 4935bf9..eba97f3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,4 @@
 venv/
 *.egg-info/
 __pycache__/
-*.test_*.srt
 dist/
diff --git a/README.md b/README.md
index 06c4580..c71d38b 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ python3.9 -m pip install subprompt
 
 ## Usage
 ```
-usage: subprompt.py [-h] (-d | -r R) [-n N] REGEX FILES [FILES ...]
+usage: subprompt [-h] (-d | -r SUB) [-n N] REGEX FILES [FILES ...]
 
 Modifies lines matched by a regex interactively
 
@@ -20,6 +20,6 @@ positional arguments:
 optional arguments:
   -h, --help  show this help message and exit
   -d          delete line
-  -r R        replace match with expression
+  -r SUB      replace match with expression
   -n N        size of lines preview (default=3)
 ```
diff --git a/setup.cfg b/setup.cfg
index 13f420a..1747c65 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = subprompt
-version = 0.0.7
+version = 0.0.9
 author = Augusto Lenz Gunsch
 author_email = augusto@augustogunsch.com
 description = Substitute Regex in files with prompt confirmation
diff --git a/src/subprompt/subprompt.py b/src/subprompt/subprompt.py
index 6df16ae..36ef2e2 100644
--- a/src/subprompt/subprompt.py
+++ b/src/subprompt/subprompt.py
@@ -166,7 +166,7 @@ def run(args):
     parser.add_argument('regex', metavar='REGEX', type=str)
     action = parser.add_mutually_exclusive_group(required=True)
     action.add_argument('-d', help='delete line', action='store_true')
-    action.add_argument('-r', help='replace match with expression', type=str)
+    action.add_argument('-r', help='replace match with expression', type=str, metavar='SUB')
     parser.add_argument('files', metavar='FILES', nargs='+', type=str)
     parser.add_argument('-n', help='size of lines preview (default=3)', type=int, default=3)