diff --git a/src/changelog.rs b/src/changelog.rs
index ed32e66..1d96b1b 100644
--- a/src/changelog.rs
+++ b/src/changelog.rs
@@ -77,7 +77,10 @@ pub async fn generate_entry(
         std::env::current_dir()?
     };
     let commits = match Repository::open(&repo_path) {
-        Ok(repo) => get_commits_since_version(&repo, &old_version)?,
+        Ok(repo) => {
+            let repo_changelog = changelog_in_repo(&repo, &changelog_path);
+            get_commits_since_version(&repo, &old_version, repo_changelog.as_deref())?
+        }
         // If there is no git repo (e.g. package downloaded from archive),
         // we just generate an empty list of changes
         Err(_e) => Vec::new(),
@@ -362,51 +365,75 @@ pub fn parse_changelog_footer(path: &Path) -> Result<(String, String), Box<dyn s
 }
 
 /*
-* Obtain all commit messages as a list since a tagged version in a git repository
+* Obtain all commit messages as a list since the previous release, to
+* format into a changelog entry
 */
 fn get_commits_since_version(
     repo: &Repository,
     version: &str,
+    changelog_path: Option<&Path>,
 ) -> Result<Vec<String>, Box<dyn std::error::Error>> {
-    let mut revwalk = repo.revwalk()?;
-    revwalk.set_sorting(Sort::TIME)?;
+    // Preferred boundary: the tag of the current (previous) version
+    if let Some(tag_id) = find_version_tag(repo, version) {
+        return commit_summaries_since(repo, tag_id);
+    }
 
-    // We are looking for debian version numbers
-    // Depending on the repo, they could be tagged with the following formats
-    let tag_names = vec![
+    // No tag: fall back to the last commit that modified the changelog
+    // itself, whose commit introduces the previous entry. Its changes
+    // since then are the new entry's content — so entries stay correct in
+    // repositories that commit their changelogs without tagging them.
+    let Some(rel_path) = changelog_path else {
+        return Ok(Vec::new());
+    };
+    let Some(boundary) = last_commit_touching(repo, rel_path)? else {
+        // The changelog was never committed; nothing to walk from
+        return Ok(Vec::new());
+    };
+
+    // Prefer a tag of the version the committed changelog carries: it may
+    // point past the changelog commit itself (e.g. a later release commit)
+    let boundary_id = version_at_commit(repo, &boundary, rel_path)
+        .and_then(|committed_version| find_version_tag(repo, &committed_version))
+        .unwrap_or_else(|| boundary.id());
+    commit_summaries_since(repo, boundary_id)
+}
+
+/// The commit names a Debian version may be tagged under in a repository
+fn version_tag_names(version: &str) -> Vec<String> {
+    vec![
         format!("debian/{}", version),
         format!("debian/v{}", version),
         format!("v{}", version),
         version.to_string(),
-    ];
+    ]
+}
 
-    // Look for the different tag formats in the git repository
-    let mut tag_id: Option<Oid> = None;
-    for tag_name in tag_names {
+/// Find the commit a version tag points at, probing the usual tag formats
+fn find_version_tag(repo: &Repository, version: &str) -> Option<Oid> {
+    for tag_name in version_tag_names(version) {
         if let Ok(r) = repo.revparse_single(&tag_name) {
-            // If we found either a commit or a tag matching the name,
-            // we have found our version
+            // A matching name resolves either to a commit (lightweight
+            // tag) or to a tag object (annotated tag)
             if let Some(commit) = r.as_commit() {
-                tag_id = Some(commit.id());
-                break;
+                return Some(commit.id());
             } else if let Some(tag) = r.as_tag() {
-                tag_id = Some(tag.target_id());
-                break;
+                return Some(tag.target_id());
             }
         }
     }
+    None
+}
 
-    if let Some(tid) = tag_id {
-        revwalk.push_head()?;
-        revwalk.hide(tid)?;
-    } else {
-        // Tag not found...
-        // We return an empty list.
-        // TODO: Can we do better?
-        return Ok(Vec::new());
-    }
+/// The commit summaries from HEAD down to (excluding) `boundary`
+fn commit_summaries_since(
+    repo: &Repository,
+    boundary: Oid,
+) -> Result<Vec<String>, Box<dyn std::error::Error>> {
+    let mut revwalk = repo.revwalk()?;
+    revwalk.set_sorting(Sort::TIME)?;
+    revwalk.push_head()?;
+    revwalk.hide(boundary)?;
 
-    // Add all commit messages from that tagged version to head in the list
     let mut commits = Vec::new();
     for id in revwalk {
         let id = id?;
@@ -421,6 +448,81 @@ fn get_commits_since_version(
     Ok(commits)
 }
 
+/// The changelog path relative to the repository root, used to walk the
+/// history of the file. `None` when the changelog lives outside the
+/// repository working directory.
+fn changelog_in_repo(repo: &Repository, changelog_path: &Path) -> Option<std::path::PathBuf> {
+    let workdir = repo.workdir()?.canonicalize().ok()?;
+    let absolute = if changelog_path.is_absolute() {
+        changelog_path.to_path_buf()
+    } else {
+        std::env::current_dir().ok()?.join(changelog_path)
+    };
+    let absolute = absolute.canonicalize().ok()?;
+    absolute
+        .strip_prefix(&workdir)
+        .ok()
+        .map(|p| p.to_path_buf())
+}
+
+/// The last commit that modified the file at `rel_path`, newest first
+fn last_commit_touching<'a>(
+    repo: &'a Repository,
+    rel_path: &Path,
+) -> Result<Option<git2::Commit<'a>>, Box<dyn std::error::Error>> {
+    let mut revwalk = repo.revwalk()?;
+    revwalk.set_sorting(Sort::TIME)?;
+    if repo.head().is_err() {
+        // Unborn HEAD: the repository has no commits yet
+        return Ok(None);
+    }
+    revwalk.push_head()?;
+
+    for id in revwalk {
+        let commit = repo.find_commit(id?)?;
+        if commit_touches_path(repo, &commit, rel_path)? {
+            return Ok(Some(commit));
+        }
+    }
+    Ok(None)
+}
+
+/// Whether `commit` modified the file at `rel_path` relative to its first
+/// parent (a root commit counts when it adds the file)
+fn commit_touches_path(
+    repo: &Repository,
+    commit: &git2::Commit<'_>,
+    rel_path: &Path,
+) -> Result<bool, Box<dyn std::error::Error>> {
+    let new_tree = commit.tree()?;
+    let parent_tree = if commit.parent_count() > 0 {
+        Some(commit.parent(0)?.tree()?)
+    } else {
+        None
+    };
+    let mut opts = git2::DiffOptions::new();
+    opts.pathspec(rel_path.to_string_lossy().to_string());
+    let diff = repo.diff_tree_to_tree(parent_tree.as_ref(), Some(&new_tree), Some(&mut opts))?;
+    Ok(diff.deltas().len() > 0)
+}
+
+/// The version recorded by the changelog content as of `commit`
+fn version_at_commit(
+    repo: &Repository,
+    commit: &git2::Commit<'_>,
+    rel_path: &Path,
+) -> Option<String> {
+    let blob = commit
+        .tree()
+        .ok()?
+        .get_path(rel_path)
+        .ok()
+        .and_then(|entry| repo.find_blob(entry.id()).ok())?;
+    let content = std::str::from_utf8(blob.content()).ok()?;
+    let entry = crate::debian::parse_changelog_entry_from_str(content).ok()?;
+    Some(entry.version.full())
+}
+
 /*
 * Create a changelog entry from information, i.e. format that information
 * into a changelog entry
@@ -703,6 +805,153 @@ mod tests {
         assert!(content.contains("mypackage (0.1.0-1) unstable; urgency=medium"));
     }
 
+    /// Without any version tag, the history of the changelog itself
+    /// delimits the entry: the commits since the changelog was last
+    /// committed are the changes, and the changelog commit is not one.
+    #[tokio::test]
+    async fn test_generate_entry_without_tags() {
+        let temp_dir = TempDir::new().unwrap();
+        let repo_dir = temp_dir.path();
+        setup_repo(repo_dir);
+
+        let changelog_path = repo_dir.join("debian/changelog");
+        std::fs::create_dir_all(repo_dir.join("debian")).unwrap();
+        let initial_content = "mypackage (0.1.0-1) unstable; urgency=medium\n\n  * Initial release\n\n -- Maintainer <m@e.com>  Wed, 01 Jan 2020 00:00:00 +0000\n";
+        std::fs::write(&changelog_path, initial_content).unwrap();
+
+        // Commit the changelog, but do not tag it
+        Command::new("git")
+            .arg("add")
+            .arg(".")
+            .current_dir(repo_dir)
+            .output()
+            .unwrap();
+        commit(repo_dir, "Initial commit");
+
+        commit(repo_dir, "Fix bug A");
+        commit(repo_dir, "Add feature B");
+
+        let _identity = IDENTITY_LOCK.lock().await;
+        unsafe {
+            std::env::set_var("DEBFULLNAME", "Maintainer Maintainer");
+            std::env::set_var("DEBEMAIL", "maintainer@maintainer.com");
+        }
+        generate_entry(
+            "debian/changelog",
+            Some(repo_dir),
+            None,
+            None,
+            EntryKind::Normal,
+        )
+        .await
+        .unwrap();
+        unsafe {
+            std::env::remove_var("DEBFULLNAME");
+            std::env::remove_var("DEBEMAIL");
+        }
+
+        let content = std::fs::read_to_string(&changelog_path).unwrap();
+        assert!(content.contains("mypackage (0.1.0-2) unstable; urgency=medium"));
+        assert!(content.contains("* Fix bug A"));
+        assert!(content.contains("* Add feature B"));
+        assert!(!content.contains("* Initial commit"));
+    }
+
+    /// A changelog that was never committed has no revision to walk the
+    /// history from: the entry is generated without commit summaries.
+    #[tokio::test]
+    async fn test_generate_entry_uncommitted_changelog() {
+        let temp_dir = TempDir::new().unwrap();
+        let repo_dir = temp_dir.path();
+        setup_repo(repo_dir);
+
+        let changelog_path = repo_dir.join("debian/changelog");
+        std::fs::create_dir_all(repo_dir.join("debian")).unwrap();
+        std::fs::write(&changelog_path, "mypackage (0.1.0-1) unstable; urgency=medium\n\n  * Initial release\n\n -- Maintainer <m@e.com>  Wed, 01 Jan 2020 00:00:00 +0000\n").unwrap();
+        commit(repo_dir, "Some change");
+
+        let _identity = IDENTITY_LOCK.lock().await;
+        unsafe {
+            std::env::set_var("DEBFULLNAME", "Maintainer Maintainer");
+            std::env::set_var("DEBEMAIL", "maintainer@maintainer.com");
+        }
+        generate_entry(
+            "debian/changelog",
+            Some(repo_dir),
+            None,
+            None,
+            EntryKind::Normal,
+        )
+        .await
+        .unwrap();
+        unsafe {
+            std::env::remove_var("DEBFULLNAME");
+            std::env::remove_var("DEBEMAIL");
+        }
+
+        let content = std::fs::read_to_string(&changelog_path).unwrap();
+        assert!(content.contains("mypackage (0.1.0-2) unstable; urgency=medium"));
+        assert!(!content.contains("* Some change"));
+    }
+
+    /// An uncommitted newer entry on top of the changelog (e.g. UNRELEASED
+    /// from a previous run) does not hide the previous version: the tag of
+    /// the last *committed* version is still used as the boundary.
+    #[tokio::test]
+    async fn test_generate_entry_tag_from_committed_version() {
+        let temp_dir = TempDir::new().unwrap();
+        let repo_dir = temp_dir.path();
+        setup_repo(repo_dir);
+
+        let changelog_path = repo_dir.join("debian/changelog");
+        std::fs::create_dir_all(repo_dir.join("debian")).unwrap();
+        let initial_content = "mypackage (0.1.0-1) unstable; urgency=medium\n\n  * Initial release\n\n -- Maintainer <m@e.com>  Wed, 01 Jan 2020 00:00:00 +0000\n";
+        std::fs::write(&changelog_path, initial_content).unwrap();
+
+        Command::new("git")
+            .arg("add")
+            .arg(".")
+            .current_dir(repo_dir)
+            .output()
+            .unwrap();
+        commit(repo_dir, "Initial commit");
+        tag(repo_dir, "debian/0.1.0-1");
+
+        commit(repo_dir, "Fix bug A");
+        commit(repo_dir, "Add feature B");
+
+        // Leave an uncommitted newer entry on top
+        let mut unreleased = String::from(
+            "mypackage (0.1.0-2) UNRELEASED; urgency=medium\n\n  * WIP.\n\n -- Maintainer <m@e.com>  Wed, 01 Jan 2020 00:00:00 +0000\n",
+        );
+        unreleased.push_str(initial_content);
+        std::fs::write(&changelog_path, unreleased).unwrap();
+
+        let _identity = IDENTITY_LOCK.lock().await;
+        unsafe {
+            std::env::set_var("DEBFULLNAME", "Maintainer Maintainer");
+            std::env::set_var("DEBEMAIL", "maintainer@maintainer.com");
+        }
+        generate_entry(
+            "debian/changelog",
+            Some(repo_dir),
+            None,
+            None,
+            EntryKind::Normal,
+        )
+        .await
+        .unwrap();
+        unsafe {
+            std::env::remove_var("DEBFULLNAME");
+            std::env::remove_var("DEBEMAIL");
+        }
+
+        let content = std::fs::read_to_string(&changelog_path).unwrap();
+        assert!(content.contains("mypackage (0.1.0-3) UNRELEASED; urgency=medium"));
+        assert!(content.contains("* Fix bug A"));
+        assert!(content.contains("* Add feature B"));
+    }
+
     #[test]
     fn test_compute_new_version() {
         // Debian upload