diff --git a/src/nanosvg/README-prusa.txt b/src/nanosvg/README-prusa.txt
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--- /dev/null
+++ b/src/nanosvg/README-prusa.txt
@@ -0,0 +1 @@
+Upstream source: https://github.com/memononen/nanosvg/tree/c1f6e209c16b18b46aa9f45d7e619acf42c29726
\ No newline at end of file