diff --git a/src/cli.rs b/src/cli.rs
index 7724873..84664b6 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -68,6 +68,9 @@ pub struct UseArgs {
     /// whether or not to use it in the global context
     #[arg(short, long)]
     pub global: bool,
+    /// whether or not to set up commit signing using ssh key
+    #[arg(short, long)]
+    pub sign: bool,
 }
 
 impl UseArgs {
@@ -83,6 +86,13 @@ impl UseArgs {
 
         git::set_git_config("user.name", &profile.username, self.global)?;
         git::set_git_config("user.email", &profile.email, self.global)?;
+        if let Some(key) = &profile.ssh_key {
+            git::set_git_config("user.signingkey", key, self.global)?;
+        }
+        if self.sign {
+            git::set_git_config("commit.gpgsign", "true", self.global)?;
+            git::set_git_config("gpg.format", "ssh", self.global)?;
+        }
         Ok(())
     }
 }
@@ -97,6 +107,9 @@ pub struct AddArgs {
     /// git user.email
     #[arg(long)]
     pub email: String,
+    /// git user.signingkey
+    #[arg(long)]
+    pub key: Option<String>,
 }
 
 impl AddArgs {
@@ -111,6 +124,7 @@ impl AddArgs {
             name: self.profile_name,
             username: self.name,
             email: self.email,
+            ssh_key: self.key,
         });
         config::write_profile_list(profiles)?;
         println!("profile added");
diff --git a/src/config.rs b/src/config.rs
index 7229606..8ed2d85 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -12,6 +12,7 @@ pub struct Profile {
     pub name: String,
     pub username: String,
     pub email: String,
+    pub ssh_key: Option<String>,
 }
 
 fn get_config_dir() -> Result<PathBuf, Box<dyn Error>> {