diff --git a/doc/INDEX.md b/doc/INDEX.md
index 4c615fb..3b739a9 100644
--- a/doc/INDEX.md
+++ b/doc/INDEX.md
@@ -11,3 +11,9 @@ DOCUMENTATION
     * ...tsconfig.json, shims-vue.d.ts, main.ts, index.html
     * see [vue3+typescript+vite](https://stackoverflow.com/questions/63724523/how-to-add-typescript-to-vue-3-and-vite-project#64438876)
   * npm run dev
+
+## Logo
+
+inspired by 
+Astrologia: Yantra de Śrī Kamalātmikā Devī
+https://sriganesa.blogspot.com/2014/03/yantra-de-sri-kamalatmika-devi.html
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