diff --git a/bash/.bash_profile b/bash/.bash_profile
index dd51de0..acc9414 100644
--- a/bash/.bash_profile
+++ b/bash/.bash_profile
@@ -1,4 +1,4 @@
-#!/bin/bash
+# shellcheck shell=sh
 # ~/.bash_profile: executed by the command interpreter for login shells.
 #
 # see /usr/share/doc/bash/examples/startup-files for examples.
@@ -26,8 +26,13 @@ if [ -d "$HOME/.local/bin" ] ; then
     PATH="$HOME/.local/bin:$PATH"
 fi
 
-
 # set PATH so it includes '~/AppImage' directory, if it exists
 if [ -d "$HOME/AppImage" ] ; then
     PATH="$HOME/AppImage:$PATH"
 fi
+
+# Environment variables
+# XDG Base Directory specification
+export XDG_CONFIG_HOME="$HOME/.config"
+export XDG_CACHE_HOME="$HOME/.cache"
+export XDG_DATA_HOME="$HOME/.local/share"
diff --git a/bash/.profile b/bash/.profile
index d89ea5a..8eeef42 100644
--- a/bash/.profile
+++ b/bash/.profile
@@ -1,3 +1,4 @@
+# shellcheck shell=sh
 # ~/.profile: executed by the command interpreter for login shells.
 # This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login
 # exists.
@@ -25,3 +26,14 @@ fi
 if [ -d "$HOME/.local/bin" ] ; then
     PATH="$HOME/.local/bin:$PATH"
 fi
+
+# set PATH so it includes '~/AppImage' directory, if it exists
+if [ -d "$HOME/AppImage" ] ; then
+    PATH="$HOME/AppImage:$PATH"
+fi
+
+# Environment variables
+# XDG Base Directory specification
+export XDG_CONFIG_HOME="$HOME/.config"
+export XDG_CACHE_HOME="$HOME/.cache"
+export XDG_DATA_HOME="$HOME/.local/share"