diff --git a/esp/rust/03_aht20/README.md b/esp/rust/03_aht20/README.md
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--- /dev/null
+++ b/esp/rust/03_aht20/README.md
@@ -0,0 +1,3 @@
+https://asairsensors.com/wp-content/uploads/2021/09/Data-Sheet-AHT20-Humidity-and-Temperature-Sensor-ASAIR-V1.0.03.pdf
+
+https://github.com/rust-dd/embedded-dht-rs/tree/main/src
\ No newline at end of file
diff --git a/esp/rust/03_aht20/README.md.txt b/esp/rust/03_aht20/README.md.txt
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