diff --git a/tldr/cidr b/tldr/cidr
new file mode 100644
index 00000000..198e87c1
--- /dev/null
+++ b/tldr/cidr
@@ -0,0 +1,29 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cidr
+
+> Simplifies IPv4/IPv6 CIDR network prefix management with counting, overlap checking, explanation, and subdivision.
+> More information: <https://github.com/bschaatsbergen/cidr>.
+
+- Explain a CIDR range:
+
+`cidr explain {{10.0.0.0/16}}`
+
+- Check whether an address belongs to a CIDR range:
+
+`cidr contains {{10.0.0.0/16}} {{10.0.14.5}}`
+
+- Get a count of all addresses in a CIDR range:
+
+`cidr count {{10.0.0.0/16}}`
+
+- Check whether two CIDR ranges overlap:
+
+`cidr overlaps {{10.0.0.0/16}} {{10.0.14.0/22}}`
+
+- Divide a CIDR range into a specific number of networks:
+
+`cidr divide {{10.0.0.0/16}} {{9}}`
diff --git a/tldr/linux/grub2-mkpasswd-pbkdf2 b/tldr/linux/grub2-mkpasswd-pbkdf2
new file mode 100644
index 00000000..9bcb9825
--- /dev/null
+++ b/tldr/linux/grub2-mkpasswd-pbkdf2
@@ -0,0 +1,13 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# grub2-mkpasswd-pbkdf2
+
+> Generate a hashed password for GRUB.
+> More information: <https://manned.org/grub2-mkpasswd-pbkdf2>.
+
+- Create a password hash for GRUB 2 using PBKDF2 and print it to `stdout`:
+
+`sudo grub2-mkpasswd-pbkdf2 {{-c|--iteration-count}} {{number_of_pbkdf2_iterations}} {{-s|--salt}} {{salt_length}}`
diff --git a/tldr/ls b/tldr/ls
index 7deef201..87e5a863 100644
--- a/tldr/ls
+++ b/tldr/ls
@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # ls
 
 > List directory contents.
-> More information: <https://www.gnu.org/software/coreutils/ls>.
+> More information: <https://www.gnu.org/software/coreutils/manual/html_node/ls-invocation.html>.
 
 - List files one per line: