diff --git a/help/linux/tool/tmux.md b/help/linux/tool/tmux.md
index d2b7be1..0787c1d 100644
--- a/help/linux/tool/tmux.md
+++ b/help/linux/tool/tmux.md
@@ -1 +1,11 @@
 TODO: Add tmux.
+
+# Tmux.
+
+## Default keymaps.
+
+## Customization.
+
+### Keymaps.
+
+### Statusbar.
diff --git a/help/linux/tool/tr.md b/help/linux/tool/tr.md
new file mode 100644
index 0000000..3379f53
--- /dev/null
+++ b/help/linux/tool/tr.md
@@ -0,0 +1 @@
+TODO: add tr info.