diff --git a/README.md b/README.md
index 65a9a86..4118056 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,8 @@ This project is developed and maintained by the [Resources team][team].
- [Community](#community)
- [Community Chat Rooms](#community-chat-rooms)
- [Books, blogs, and training materials](#books-blogs-and-training-materials)
+ - [Free and public materials](#free-and-public-materials)
+ - [Paid and commercially available materials](#paid-and-commercially-available-materials)
- [Tools](#tools)
- [Real-time](#real-time)
- [Real-time Operating System (RTOS)](#real-time-operating-system-rtos)
@@ -805,6 +807,7 @@ Otherwise, please add it to the [WIP section](#wip) below.
1. [FUSB302B] - I2C - Programmable USB Type‐C Controller with USB Power Delivery - [github][69]
1. [HC-12] - SERIAL - Wireless serial transceiver module - [Intro blog post][56] - [github][53] - [](https://crates.io/crates/hc12-at)
1. [HTS221] - I2C - Humidity and temperature sensor - [Intro blog post][7] - [](https://crates.io/crates/hts221)
+1. [IS31FL3728] - I2C - LED dot matrix display mode (8×8, 5x11, 6x10,7x9) - [github](https://github.com/leonidv/is31fl3728-rs) -[](https://crates.io/crates/is31fl3728-rs)
1. [IIS2MDC] - I2C - ST's High accuracy, ultra-low-power, 3-axis digital output magnetometer - [](https://crates.io/crates/iis2mdc)
1. [ISM330DHCX] - I2C - ST's IMU with 3D accelerometer, 3D gyroscope, ML core and more - [](https://crates.io/crates/ism330dhcx)
1. [keypad] - GPIO - Keypad matrix circuits - [Intro post][14] - [](https://crates.io/crates/keypad)
@@ -963,6 +966,7 @@ Otherwise, please add it to the [WIP section](#wip) below.
[FH101RF]: https://crates.io/crates/fh101rf
[FUSB302B]: https://github.com/fmckeogh/usb-pd-rs
[HTS221]: https://crates.io/crates/hts221
+[IS31FL3728]: https://crates.io/crates/is31fl3728-rs
[IIS2MDC]: https://crates.io/crates/iis2mdc
[ISM330DHCX]: https://crates.io/crates/ism330dhcx
[keypad]: https://crates.io/crates/keypad