diff --git a/how_to b/how_to
index 47c4741..56a2229 100644
--- a/how_to
+++ b/how_to
@@ -31,6 +31,8 @@ Usefull packages :
         lnav
     Backlight management:
         light               # http://haikarainen.github.io/light/
+    IRC:
+        catgirl             # https://git.causal.agency/catgirl
 
 System setup:
     display/drivers:
@@ -459,6 +461,8 @@ Borg backup:
 
 Serial terminal
     st -l /dev/ttyUSB0 <baud>
+    # Or
+    minicom -D /dev/ttyUSB0 -b <baud>
 
 Wifi AP:
     https://wiki.archlinux.org/index.php/Software_access_point
@@ -627,7 +631,8 @@ Install 64 bits kernel on 32 bits system (and 64 bits hardware) (bad idea)
 
 Compile C for ATmega328p/Arduino:
     sudo xbps-install -S avr-gcc avr-libc avrdude
-    sudo usermod -aG dialout <user> # Or /dev/ttyACM0 group
+    sudo pacman -S avr-libc avrdude
+    sudo usermod -aG dialout <user> # Or /dev/ttyACM0 group (might be uucp)
 
     avr-gcc -g -Os -DF_CPU=16000000UL -mmcu=atmega328p -c -o <name>.o <name>.c
     avr-gcc  -mmcu=atmega328p <name>.o -o <name>
@@ -1111,3 +1116,17 @@ GPG:
 
 Windows use realtime clock as UTC:
     HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation\RealTimeIsUniversal = QWORD 0x01
+
+sway / wayland:
+    Get current active (first) keyboard layout name:
+        # https://queer.hacktivis.me/objects/73823f56-1954-44fe-b046-39e726cca67b
+        swaymsg -t get_inputs | jq 'map(select(.type == "keyboard"))[0].xkb_active_layout_name'
+
+Bluetooth:
+    Get access to deprecated gatttool and hcitool:
+        trizen -S bluez-utils-compat
+            Add `--disable-systemd` to ./configure command on Artix
+
+Extract debian .deb package:
+    ar x <package>.deb
+    tar xf data.tar.xz