diff --git a/pyproject.toml b/pyproject.toml
index b4e86aa..8ece73c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,6 +29,7 @@ classifiers = [
     "Natural Language :: English",
     "Intended Audience :: Science/Research",
     "Topic :: Scientific/Engineering :: Chemistry",
+    "Topic :: Scientific/Engineering :: Oceanography",
 ]
 dynamic = ["version"]