diff --git a/alioth-cli/src/main.rs b/alioth-cli/src/main.rs
index 4f27d2c7..d1e6f587 100644
--- a/alioth-cli/src/main.rs
+++ b/alioth-cli/src/main.rs
@@ -44,34 +44,34 @@ struct Cli {
     /// If not set, environment variable $RUST_LOG is used.
     pub log_spec: Option<String>,
 
-    /// Log to file instead of STDERR.
-    #[arg(long)]
-    pub log_to_file: bool,
-
-    /// Path to a directory where the log file is stored.
+    /// Path to a directory where the log file is stored, otherwise log to STDERR.
     #[arg(long, value_name = "PATH")]
     pub log_dir: Option<Box<Path>>,
 
+    /// Name of the log file, if logging to a directory is enabled.
+    /// If not set, a default name is used.
+    #[arg(long, value_name = "NAME", requires = "log_dir")]
+    pub log_file: Option<Box<str>>,
+
     #[command(subcommand)]
     pub cmd: Command,
 }
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let cli = Cli::parse();
-    let logger = if let Some(ref spec) = cli.log_spec {
+    let mut logger = if let Some(ref spec) = cli.log_spec {
         Logger::try_with_str(spec)
     } else {
         Logger::try_with_env_or_str("warn")
     }?;
-    let logger = if cli.log_to_file {
-        logger.log_to_file(
-            FileSpec::default()
-                .suppress_timestamp()
-                .o_directory(cli.log_dir),
-        )
-    } else {
-        logger
-    };
+    if let Some(log_dir) = cli.log_dir {
+        let spec = if let Some(name) = cli.log_file {
+            FileSpec::try_from(log_dir.join(&*name))?
+        } else {
+            FileSpec::default().directory(log_dir)
+        };
+        logger = logger.log_to_file(spec);
+    }
     let _handle = logger.start()?;
     log::debug!(
         "{} {} started...",