GNU/Linux Manjaro Installing Broadcom BCM4311/BCM4312/BCM4313 Driver Guide
Hi! The linked Tutorial shows you Step-by-Step How to Install Broadcom BCM4311/BCM4312/BCM4313 Wi-fi/Bluetooth Driver in Manjaro GNU/Linux Desktop.
The Package Provides the Source Code for the wl Kernel Modules and makes use of the DKMS Build Utility to Install them for the Running Kernel.
GNU/Linux Manjaro Broadcom BCM4311/BCM4312/BCM4313 Driver Installation Guide