diff --git a/pyproject.toml b/pyproject.toml
index 18d5acd..2752c0e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,6 +10,7 @@ homepage = "https://gitlab.com/chrisberkhout/pricehist"
 repository = "https://gitlab.com/chrisberkhout/pricehist"
 include = [
     "LICENSE",
+    "example-gnuplot.png",
 ]
 
 [tool.poetry.dependencies]