diff --git a/smath/CHANGELOG.md b/smath/CHANGELOG.md
index c5e033ba..cb8b40a6 100644
--- a/smath/CHANGELOG.md
+++ b/smath/CHANGELOG.md
@@ -7,6 +7,7 @@
 - Minor simplification in `tsconfig.json`
 - Add badges in README
 - Add keywords in `package.json`
+- Add funding in `package.json`
 
 ## 0.0.3
 
diff --git a/smath/package.json b/smath/package.json
index 83516f47..d18c9915 100644
--- a/smath/package.json
+++ b/smath/package.json
@@ -34,6 +34,10 @@
     "email": "smath@nicolasventura.com",
     "url": "https://nicolasventura.com/"
   },
+  "funding": {
+    "type": "paypal",
+    "url": "https://www.paypal.com/donate/?business=UM6EEKPW8GXA2&no_recurring=0&item_name=Open+source+development&currency_code=USD"
+  },
   "repository": {
     "type": "git",
     "url": "https://github.com/nicfv/npm",