diff --git a/src/commit.rs b/src/commit.rs
index d7decb4..b7e0824 100644
--- a/src/commit.rs
+++ b/src/commit.rs
@@ -87,3 +87,15 @@ pub fn pre_commit_check(pre_commit_command: Option<String>, message: &str) -> Re
     }
     Ok(())
 }
+
+pub fn git_add_all_modified() -> Result<()> {
+    let output = git_exec(&["add", "-u"])?;
+    std::io::stdout().write_all(&output.stdout)?;
+    std::io::stderr().write_all(&output.stderr)?;
+
+    if !output.status.success() {
+        return Err(anyhow!("Could not add files to staged area"));
+    }
+
+    Ok(())
+}
diff --git a/src/main.rs b/src/main.rs
index fe33743..9134db8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,7 +5,11 @@
     clippy::cargo,
     clippy::str_to_string
 )]
-#![allow(clippy::module_name_repetitions, clippy::multiple_crate_versions)]
+#![allow(
+    clippy::module_name_repetitions,
+    clippy::multiple_crate_versions,
+    clippy::struct_excessive_bools
+)]
 
 mod commit;
 mod commit_message;
@@ -17,7 +21,8 @@ use std::io::Write;
 use std::path::PathBuf;
 
 use commit::{
-    check_staged_files, commit, pre_commit_check, read_cached_commit, write_cached_commit,
+    check_staged_files, commit, git_add_all_modified, pre_commit_check, read_cached_commit,
+    write_cached_commit,
 };
 use commit_message::make_message_commit;
 
@@ -38,11 +43,18 @@ struct Args {
     /// Retry commit with the same message as the last one
     #[arg(short, long)]
     retry: bool,
+    /// Add all modified files into staging
+    #[arg(short, long)]
+    all: bool,
 }
 
 fn main() -> Result<()> {
     let args = Args::parse();
 
+    if args.all {
+        git_add_all_modified()?;
+    }
+
     check_staged_files()?;
 
     if args.init {