diff --git a/tldr/chgrp b/tldr/chgrp
index b3269d7f..4ffdcb68 100644
--- a/tldr/chgrp
+++ b/tldr/chgrp
@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # chgrp
 
 > Change group ownership of files and directories.
-> More information: <https://www.gnu.org/software/coreutils/chgrp>.
+> More information: <https://www.gnu.org/software/coreutils/manual/html_node/chgrp-invocation.html>.
 
 - Change the owner group of a file/directory:
 
diff --git a/tldr/chroot b/tldr/chroot
index b764f8c1..5ab97515 100644
--- a/tldr/chroot
+++ b/tldr/chroot
@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # chroot
 
 > Run command or interactive shell with special root directory.
-> More information: <https://www.gnu.org/software/coreutils/chroot>.
+> More information: <https://www.gnu.org/software/coreutils/manual/html_node/chroot-invocation.html>.
 
 - Run command as new root directory:
 
diff --git a/tldr/gh-skyline b/tldr/gh-skyline
new file mode 100644
index 00000000..88b82c84
--- /dev/null
+++ b/tldr/gh-skyline
@@ -0,0 +1,42 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gh skyline
+
+> Generate a 3D model of your GitHub contribution history.
+> By default, it will create a `{username}-{year}-github-skyline.stl` file in the current directory.
+> More information: <https://github.com/github/gh-skyline>.
+
+- Generate a skyline STL file for the current year and authenticated user:
+
+`gh skyline`
+
+- Generate a skyline for a specific [u]ser and [y]ear:
+
+`gh skyline --user {{username}} --year {{year}}`
+
+- Generate a skyline for a range of [y]ears:
+
+`gh skyline --user {{username}} --year {{first_year}}-{{last_year}}`
+
+- Generate a [f]ull skyline (from the user's join year to the current year):
+
+`gh skyline --user {{username}} --full`
+
+- Enable [d]ebug logging:
+
+`gh skyline --debug`
+
+- Generate a skyline and specify the [o]utput file path:
+
+`gh skyline --output {{path/to/output_file.stl}}`
+
+- Open the GitHub profile for a specific [u]ser:
+
+`gh skyline --user {{username}} --web`
+
+- Display [h]elp:
+
+`gh skyline --help`
diff --git a/tldr/git-branch b/tldr/git-branch
index 174ad79b..c884e4c3 100644
--- a/tldr/git-branch
+++ b/tldr/git-branch
@@ -28,11 +28,11 @@ source: https://github.com/tldr-pages/tldr.git
 
 `git branch {{branch_name}} {{commit_hash}}`
 
-- Rename a branch (must not have it checked out to do this):
+- Rename a branch (you must switch to a different branch before doing this):
 
 `git branch {{-m|--move}} {{old_branch_name}} {{new_branch_name}}`
 
-- Delete a local branch (must not have it checked out to do this):
+- Delete a local branch (you must switch to a different branch before doing this):
 
 `git branch {{-d|--delete}} {{branch_name}}`
 
diff --git a/tldr/linux/loginctl b/tldr/linux/loginctl
index 91b7f305..a5749279 100644
--- a/tldr/linux/loginctl
+++ b/tldr/linux/loginctl
@@ -27,3 +27,7 @@ source: https://github.com/tldr-pages/tldr.git
 - Execute a `loginctl` operation on a remote host:
 
 `loginctl list-users -H {{hostname}}`
+
+- Log a user out on all of their sessions:
+
+`loginctl terminate-user {{username}}`
diff --git a/tldr/osx/tag b/tldr/osx/tag
new file mode 100644
index 00000000..d70de04e
--- /dev/null
+++ b/tldr/osx/tag
@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, osx]
+source: https://github.com/tldr-pages/tldr.git
+---
+# tag
+
+> Edit tags on Mac OS X files (10.9 Mavericks and above).
+> More information: <https://github.com/jdberry/tag/>.
+
+- Add tags to a file:
+
+`tag --add {{tag_name1,tag_name2,...}} {{path/to/file}}`
+
+- Remove a tag:
+
+`tag --remove {{tag_name}} {{path/to/file}`
+
+- Remove all tags from a file:
+
+`tag --remove \* {{path/to/file}}`
+
+- Show all files with a given tag:
+
+`tag --match {{tag_name}}`