diff --git a/tldr/linux/kinfocenter b/tldr/linux/kinfocenter
new file mode 100644
index 00000000..1e347569
--- /dev/null
+++ b/tldr/linux/kinfocenter
@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# kinfocenter
+
+> KDE information center to show system information.
+> More information: <https://manned.org/kinfocenter>.
+
+- Open the GUI:
+
+`kinfocenter`
+
+- List all possible KCM modules for `kinfocenter`:
+
+`kinfocenter --list`
+
+- Display help:
+
+`kinfocenter {{[-h|--help]}}`
diff --git a/tldr/linux/krdpserver b/tldr/linux/krdpserver
new file mode 100644
index 00000000..2f1afcac
--- /dev/null
+++ b/tldr/linux/krdpserver
@@ -0,0 +1,17 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# krdpserver
+
+> Start an RDP server.
+> More information: <https://invent.kde.org/plasma/krdp#running-the-example-server>.
+
+- Start an RDP server with a username and password:
+
+`krdpserver {{[-u|--username]}} {{user_name}} {{[-p|--password]}} {{password}}`
+
+- Share a specific monitor marked by its index:
+
+`krdpserver {{[-u|--username]}} {{user_name}} {{[-p|--password]}} {{password}} --monitor {{n}}`
diff --git a/tldr/linux/kscreen-console b/tldr/linux/kscreen-console
index e2d14932..702011f2 100644
--- a/tldr/linux/kscreen-console
+++ b/tldr/linux/kscreen-console
@@ -30,7 +30,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Display help:
 
-`kscreen-console --help`
+`kscreen-console {{[-h|--help]}}`
 
 - Display help including Qt specific command-line options:
 
diff --git a/tldr/linux/kscreen-doctor b/tldr/linux/kscreen-doctor
index 64ae0d7a..178a6828 100644
--- a/tldr/linux/kscreen-doctor
+++ b/tldr/linux/kscreen-doctor
@@ -10,7 +10,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Show display output information:
 
-`kscreen-doctor --outputs`
+`kscreen-doctor {{[-o|--outputs]}}`
 
 - Set the rotation of a display output with an ID of 1 to the right:
 
diff --git a/tldr/linux/systemsettings b/tldr/linux/systemsettings
new file mode 100644
index 00000000..0fb80fb4
--- /dev/null
+++ b/tldr/linux/systemsettings
@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemsettings
+
+> KDE central settings program.
+> More information: <https://manned.org/systemsettings>.
+
+- Open the settings GUI:
+
+`systemsettings`
+
+- List all possible KCM modules for `systemsettings`:
+
+`systemsettings --list`
+
+- Display help:
+
+`systemsettings {{[-h|--help]}}`
diff --git a/tldr/netexec b/tldr/netexec
new file mode 100644
index 00000000..49d6d3ec
--- /dev/null
+++ b/tldr/netexec
@@ -0,0 +1,12 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# netexec
+
+> This command is an alias of `nxc`.
+
+- View documentation for the original command:
+
+`tldr nxc`
diff --git a/tldr/nix-build b/tldr/nix-build
index 6690c849..f17556c7 100644
--- a/tldr/nix-build
+++ b/tldr/nix-build
@@ -11,8 +11,8 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Build a Nix expression:
 
-`nix-build '<nixpkgs>' --attr {{firefox}}`
+`nix-build '<nixpkgs>' {{[-A|--attr]}} {{firefox}}`
 
 - Build a sandboxed Nix expression (on non-NixOS):
 
-`nix-build '<nixpkgs>' --attr {{firefox}} --option sandbox true`
+`nix-build '<nixpkgs>' {{[-A|--attr]}} {{firefox}} --option sandbox true`
diff --git a/tldr/nix-collect-garbage b/tldr/nix-collect-garbage
index a6415857..49d4f9a4 100644
--- a/tldr/nix-collect-garbage
+++ b/tldr/nix-collect-garbage
@@ -11,11 +11,11 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Delete all store paths unused by current generations of each profile:
 
-`sudo nix-collect-garbage --delete-old`
+`sudo nix-collect-garbage {{[-d|--delete-old]}}`
 
 - Simulate the deletion of old store paths:
 
-`sudo nix-collect-garbage --delete-old --dry-run`
+`sudo nix-collect-garbage {{[-d|--delete-old]}} --dry-run`
 
 - Delete all store paths older than 30 days:
 
diff --git a/tldr/osx/base64 b/tldr/osx/base64
index 677eb9ce..050c3d0c 100644
--- a/tldr/osx/base64
+++ b/tldr/osx/base64
@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # base64
 
 > Encode or decode file or `stdin` to/from base64, to `stdout` or another file.
-> More information: <https://keith.github.io/xcode-man-pages/base64.1.html>.
+> More information: <https://keith.github.io/xcode-man-pages/bintrans.1>.
 
 - Encode a file to `stdout`:
 
diff --git a/tldr/spectacle b/tldr/spectacle
index 0d341f76..31f63b21 100644
--- a/tldr/spectacle
+++ b/tldr/spectacle
@@ -14,8 +14,12 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Capture a screenshot of the active window:
 
-`spectacle --activewindow`
+`spectacle {{[-a|--activewindow]}}`
 
 - Capture a screenshot of a specific region:
 
-`spectacle --region`
+`spectacle {{[-r|--region]}}`
+
+- Start another Spectacle instance so that you can screenshot Spectacle itself:
+
+`spectacle {{[-i|--new-instance]}}`
diff --git a/tldr/sudo b/tldr/sudo
index 629a9d29..fb047d45 100644
--- a/tldr/sudo
+++ b/tldr/sudo
@@ -38,4 +38,4 @@ source: https://github.com/tldr-pages/tldr.git
 
 - List the allowed (and forbidden) commands for the invoking user:
 
-`sudo {{[-l|--list]}}`
+`sudo {{[-ll|--list --list]}}`
diff --git a/tldr/wormhole b/tldr/wormhole
index 36c8ac8f..d49f24a6 100644
--- a/tldr/wormhole
+++ b/tldr/wormhole
@@ -19,3 +19,7 @@ source: https://github.com/tldr-pages/tldr.git
 - Send raw text:
 
 `wormhole send`
+
+- Send a file with a custom code phrase:
+
+`wormhole send --code {{custom_code}} {{path/to/file}}`