diff --git a/pyproject.toml b/pyproject.toml
index c158d7d..7635d98 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,6 +52,19 @@ vcs = "git"
 # Use a custom function for the next-version step with no parameters:
 next-version = { module = "geotils.module", value = "my_next_version" }
 
+[tool.versioningit.format]
+# Format used when there have been commits since the most recent tag:
+distance = "{base_version}.post{distance}+{vcs}{rev}"
+# Example formatted version: 1.2.3.post42+ge174a1f
+
+# Format used when there are uncommitted changes:
+dirty = "{base_version}+d{build_date:%Y%m%d}"
+# Example formatted version: 1.2.3+d20230922
+
+# Format used when there are both commits and uncommitted changes:
+distance-dirty = "{base_version}.post{distance}+{vcs}{rev}.d{build_date:%Y%m%d}"
+# Example formatted version: 1.2.3.post42+ge174a1f.d20230922
+
 [project.urls]
 Homepage = "https://geogroup.ai/"
 Documentation = "https://readthedocs.org/geotils"