diff --git a/pyproject.toml b/pyproject.toml
index 3aef2fb..91a15d0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,6 +34,7 @@ classifiers = [
     "Intended Audience :: Science/Research",
     "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
     "Topic :: Scientific/Engineering :: Electronic Design Automation (EDA)",
+    "Topic :: File Formats",
     ]
 requires-python = ">=3.10"
 dynamic = ["version"]