diff --git a/README.md b/README.md
index 72b177f..2e36fcc 100644
--- a/README.md
+++ b/README.md
@@ -1,24 +1,28 @@
 # muren(mu)ltiple (ren)ames
 
+Command-line utility for filename manipulations.
+
 ```
 Usage: muren [OPTIONS] [COMMAND]
 
 Commands:
-  set-ext    Change extension
-  prefix     Prefix with string
-  replace    Replace parts of the name
-  normalize  Convert names to reasonable ASCII.
-  fix-ext    Fix extension according to the file contents.
-  remove     Remove part of a name from all files.
-  help       Print this message or the help of the given subcommand(s)
+  set-ext      Change extension
+  prefix       Prefix with string
+  replace      Replace parts of the name
+  normalize    Convert names to reasonable ASCII.
+  fix-ext      Fix extension according to the file contents.
+  remove       Remove part of a name from all files.
+  change-case  Change case of all files.
+  help         Print this message or the help of the given subcommand(s)
 
 Options:
-  -d, --dry      Dry run
-  -y, --yes      Automatically confirm all actions
-  -h, --help     Print help
-  -V, --version  Print version
+  -d, --dry        Dry run
+  -u, --unchanged  Show unchanged files
+  -y, --yes        Automatically confirm all actions
+  -h, --help       Print help
+  -V, --version    Print version
 ```
 
 ## Why not [rnr](https://github.com/ismaelgv/rnr)?
 
-Because this project scratches my particular itch and allows me to try/learn rust.
\ No newline at end of file
+Because this project scratches my particular itch and allows me to try/learn rust.
diff --git a/src/lib.rs b/src/lib.rs
index 61a6520..76e3790 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -42,7 +42,7 @@ pub enum RenameCommand {
     FixExtension(bool),
     Normalize,
     Replace(String, String, bool),
-    ChangeCase,
+    ChangeCase(bool),
 }
 
 pub struct Config {
@@ -141,9 +141,12 @@ fn suggest_renames(files: &[PathBuf], command: &RenameCommand) -> Vec<RenameInte
                     new_name: PathBuf::from(new_name),
                 }
             }
-            RenameCommand::ChangeCase => {
+            RenameCommand::ChangeCase(upper) => {
                 let path_str = path.to_string_lossy().to_string();
-                let new_name = path_str.to_lowercase();
+                let new_name = match upper {
+                    true => path_str.to_uppercase(),
+                    false => path_str.to_lowercase(),
+                };
                 RenameIntent {
                     path: path.clone(),
                     new_name: PathBuf::from(new_name),
diff --git a/src/main.rs b/src/main.rs
index 89f5489..1535a5d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -38,7 +38,9 @@ fn extract_command(args_matches: &ArgMatches) -> Option<RenameCommand> {
             matches.get_one::<String>("replacement").unwrap().clone(),
             matches.get_flag("regex"),
         )),
-        Some(("change-case", _)) => Some(RenameCommand::ChangeCase),
+        Some(("change-case", matches)) => {
+            Some(RenameCommand::ChangeCase(matches.get_flag("upper")))
+        }
         _ => None,
     }
 }
@@ -142,7 +144,7 @@ fn create_cli_command() -> Command {
                 .about("Remove part of a name from all files.")
                 .arg(
                     Arg::new("pattern")
-                        .help("The string to remove")
+                        .help("The string to remove.")
                         .action(ArgAction::Set)
                         .value_parser(value_parser!(String))
                         .required(true),
@@ -152,7 +154,13 @@ fn create_cli_command() -> Command {
         .subcommand(
             Command::new("change-case")
                 .about("Change case of all files.")
-                .arg(path_arg.clone()),
+                .arg(path_arg.clone())
+                .arg(
+                    arg!(
+                        -u --upper ... "Upper case (default: false)."
+                    )
+                    .action(clap::ArgAction::SetTrue),
+                ),
         )
 }