diff --git a/zlogin b/zlogin
index e69de29..3d5f36c 100644
--- a/zlogin
+++ b/zlogin
@@ -0,0 +1,2 @@
+# .zlogin [3] Used for executing user's commands at ending of initial progress,
+# will be sourced when starting as a login shell.
diff --git a/zlogout b/zlogout
index e69de29..e564438 100644
--- a/zlogout
+++ b/zlogout
@@ -0,0 +1 @@
+# .zlogout [4] Will be sourced when a login shell exits.
diff --git a/zprofile b/zprofile
index e69de29..418d452 100644
--- a/zprofile
+++ b/zprofile
@@ -0,0 +1,2 @@
+# .zprofile [1] Used for executing user's commands at start, will be sourced
+# when starting as a login shell.
diff --git a/zshenv b/zshenv
index 8900f16..db8fab1 100644
--- a/zshenv
+++ b/zshenv
@@ -1,3 +1,7 @@
+# .zshenv [0] Used for setting user's environment variables; it should not
+# contain commands that produce output or assume the shell is attached to a
+# tty. This file will always be sourced.
+
 # Enable saving command history to file
 HISTFILE=$HOME/.histfile
 HISTSIZE=5000
diff --git a/zshrc b/zshrc
index 1eecfb7..1d65a37 100644
--- a/zshrc
+++ b/zshrc
@@ -1,3 +1,6 @@
+# .zshrc [2] Used for setting user's interactive shell configuration and
+# executing commands, will be sourced when starting as an interactive shell.
+
 # Load plugin scripts
 plugin-load() { source ~/.config/zsh/$1/$1.plugin.zsh }
 plugin-load zsh-syntax-highlighting