diff --git a/Cargo.lock b/Cargo.lock
index 7bea7b7..45bc6b1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -174,6 +174,7 @@ dependencies = [
  "log",
  "pulldown-cmark",
  "semver",
+ "testing_logger",
  "toml_edit 0.21.1",
  "winnow 0.5.40",
 ]
@@ -2119,6 +2120,15 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "testing_logger"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d92b727cb45d33ae956f7f46b966b25f1bc712092aeef9dba5ac798fc89f720"
+dependencies = [
+ "log",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.63"
diff --git a/Cargo.toml b/Cargo.toml
index 56df9d3..f5ba84f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -43,5 +43,6 @@ bitflags = "2"
 [dev-dependencies]
 insta = "1.8.0"
 gix-testtools = "0.15.0"
+testing_logger = "0.1.1"
 
 [workspace]
diff --git a/src/cli/main.rs b/src/cli/main.rs
index 7934243..f8774d6 100644
--- a/src/cli/main.rs
+++ b/src/cli/main.rs
@@ -63,6 +63,7 @@ fn main() -> anyhow::Result<()> {
             no_isolate_dependencies_from_breaking_changes,
             capitalize_commit,
             registry,
+            signoff,
         } => {
             let verbose = execute || verbose;
             init_logging(verbose);
@@ -91,6 +92,7 @@ fn main() -> anyhow::Result<()> {
                     allow_changelog_github_release: !no_changelog_github_release,
                     capitalize_commit,
                     registry,
+                    signoff,
                 },
                 crates,
                 to_bump_spec(bump.as_deref().unwrap_or(DEFAULT_BUMP_SPEC))?,
diff --git a/src/cli/options.rs b/src/cli/options.rs
index a784195..510889c 100644
--- a/src/cli/options.rs
+++ b/src/cli/options.rs
@@ -165,6 +165,10 @@ pub enum SubCommands {
         /// Capitalize commit messages.
         #[clap(long, help_heading = Some("CHANGELOG"))]
         capitalize_commit: bool,
+
+        /// Sign off commit messages.
+        #[clap(long, help_heading = Some("CUSTOMIZATION"))]
+        signoff: bool,
     },
     #[clap(name = "changelog", version = option_env!("CARGO_SMART_RELEASE_VERSION"))]
     /// Generate changelogs from commit histories, non-destructively.
diff --git a/src/command/mod.rs b/src/command/mod.rs
index 13cbd7f..7d68e25 100644
--- a/src/command/mod.rs
+++ b/src/command/mod.rs
@@ -27,6 +27,7 @@ pub mod release {
         pub allow_changelog_github_release: bool,
         pub capitalize_commit: bool,
         pub registry: Option<String>,
+        pub signoff: bool,
     }
 }
 #[path = "release/mod.rs"]
diff --git a/src/command/release/git.rs b/src/command/release/git.rs
index b280d9c..f15d1be 100644
--- a/src/command/release/git.rs
+++ b/src/command/release/git.rs
@@ -11,6 +11,7 @@ pub(in crate::command::release_impl) fn commit_changes(
     message: impl AsRef<str>,
     dry_run: bool,
     empty_commit_possible: bool,
+    signoff: bool,
     ctx: &crate::Context,
 ) -> anyhow::Result<Option<Id<'_>>> {
     // TODO: replace with gitoxide one day
@@ -19,6 +20,9 @@ pub(in crate::command::release_impl) fn commit_changes(
     if empty_commit_possible {
         cmd.arg("--allow-empty");
     }
+    if signoff {
+        cmd.arg("--signoff");
+    }
     log::trace!("{} run {:?}", will(dry_run), cmd);
     if dry_run {
         return Ok(None);
@@ -115,3 +119,54 @@ pub fn push_tags_and_head(
         bail!("'git push' invocation failed. Try to push manually and repeat the smart-release invocation to resume, possibly with --skip-push.");
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use log::Level;
+
+    use super::*;
+
+    #[test]
+    fn test_commit_changes() {
+        let ctx = crate::Context::new(
+            vec![],
+            false,
+            crate::version::BumpSpec::Auto,
+            crate::version::BumpSpec::Auto,
+        )
+        .unwrap();
+        let message = "commit message";
+        testing_logger::setup();
+        let _ = commit_changes(message, true, false, false, &ctx).unwrap();
+        testing_logger::validate(|captured_logs| {
+            assert_eq!(captured_logs.len(), 1);
+            assert_eq!(
+                captured_logs[0].body,
+                "WOULD run \"git\" \"commit\" \"-am\" \"commit message\""
+            );
+            assert_eq!(captured_logs[0].level, Level::Trace);
+        });
+    }
+
+    #[test]
+    fn test_commit_changes_with_signoff() {
+        let ctx = crate::Context::new(
+            vec![],
+            false,
+            crate::version::BumpSpec::Auto,
+            crate::version::BumpSpec::Auto,
+        )
+        .unwrap();
+        let message = "commit message";
+        testing_logger::setup();
+        let _ = commit_changes(message, true, false, true, &ctx).unwrap();
+        testing_logger::validate(|captured_logs| {
+            assert_eq!(captured_logs.len(), 1);
+            assert_eq!(
+                captured_logs[0].body,
+                "WOULD run \"git\" \"commit\" \"-am\" \"commit message\" \"--signoff\""
+            );
+            assert_eq!(captured_logs[0].level, Level::Trace);
+        });
+    }
+}
diff --git a/src/command/release/manifest.rs b/src/command/release/manifest.rs
index 9494118..0bb50dc 100644
--- a/src/command/release/manifest.rs
+++ b/src/command/release/manifest.rs
@@ -102,7 +102,7 @@ pub(in crate::command::release_impl) fn edit_version_and_fixup_dependent_crates_
         opts.clone(),
     )?;
 
-    let res = git::commit_changes(commit_message, dry_run, !made_change, &ctx.base)?;
+    let res = git::commit_changes(commit_message, dry_run, !made_change, opts.signoff, &ctx.base)?;
     if let Some(bail_message) = bail_message {
         bail!(bail_message);
     } else {