diff --git a/readme.md b/readme.md
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--- a/readme.md
+++ b/readme.md
@@ -23,6 +23,7 @@
 ### HC-05
 - [Datasheet](https://components101.com/sites/default/files/component_datasheet/HC-05%20Datasheet.pdf)
 - [How to configure](https://lastminuteengineers.com/hc05-at-commands-tutorial/)
+- [User Instruction manual](https://www.rcscomponents.kiev.ua/datasheets/hc_hc-05-user-instructions-bluetooth.pdf)
 
 ### 3.5 inch TFT display
 - [Product link](https://www.tinytronics.nl/shop/en/displays/tft/3.5-inch-tft-display-320*480-pixels-mega-compatible-ili9486)