diff --git a/pyproject.toml b/pyproject.toml
index e9b447d..e406000 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,9 @@ homepage = "https://mpxd.net/code/jan/float_raster"
 repository = "https://mpxd.net/code/jan/float_raster"
 keywords = [
     "coverage",
+    "raster",
+    "anti-alias",
+    "polygon",
     ]
 classifiers = [
     "Programming Language :: Python :: 3",