diff --git a/.tmux.conf b/.tmux.conf
index f1cb3fe..e1193df 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -12,3 +12,31 @@ set -g status-fg white
 set -g mouse on
 
 set-option -g repeat-time 0
+
+# -- copy mode -----------------------------------------------------------------
+
+bind Enter copy-mode # enter copy mode
+
+run -b 'tmux bind -t vi-copy v begin-selection 2> /dev/null || true'
+run -b 'tmux bind -T copy-mode-vi v send -X begin-selection 2> /dev/null || true'
+run -b 'tmux bind -t vi-copy C-v rectangle-toggle 2> /dev/null || true'
+run -b 'tmux bind -T copy-mode-vi C-v send -X rectangle-toggle 2> /dev/null || true'
+run -b 'tmux bind -t vi-copy y copy-selection 2> /dev/null || true'
+run -b 'tmux bind -T copy-mode-vi y send -X copy-selection-and-cancel 2> /dev/null || true'
+run -b 'tmux bind -t vi-copy Escape cancel 2> /dev/null || true'
+run -b 'tmux bind -T copy-mode-vi Escape send -X cancel 2> /dev/null || true'
+run -b 'tmux bind -t vi-copy H start-of-line 2> /dev/null || true'
+run -b 'tmux bind -T copy-mode-vi H send -X start-of-line 2> /dev/null || true'
+run -b 'tmux bind -t vi-copy L end-of-line 2> /dev/null || true'
+run -b 'tmux bind -T copy-mode-vi L send -X end-of-line 2> /dev/null || true'
+
+# copy to X11 clipboard
+if -b 'command -v xsel > /dev/null 2>&1' 'bind y run -b "tmux save-buffer - | xsel -i -b"'
+if -b '! command -v xsel > /dev/null 2>&1 && command -v xclip > /dev/null 2>&1' 'bind y run -b "tmux save-buffer - | xclip -i -selection clipboard >/dev/null 2>&1"'
+# copy to macOS clipboard
+if -b 'command -v pbcopy > /dev/null 2>&1' 'bind y run -b "tmux save-buffer - | pbcopy"'
+if -b 'command -v reattach-to-user-namespace > /dev/null 2>&1' 'bind y run -b "tmux save-buffer - | reattach-to-user-namespace pbcopy"'
+# copy to Windows clipboard
+if -b 'command -v clip.exe > /dev/null 2>&1' 'bind y run -b "tmux save-buffer - | clip.exe"'
+if -b '[ -c /dev/clipboard ]' 'bind y run -b "tmux save-buffer - > /dev/clipboard"'
+
diff --git a/Makefile b/Makefile
index 6bfd9ed..830c235 100644
--- a/Makefile
+++ b/Makefile
@@ -16,6 +16,7 @@ clean:
 	rm -rf .ssh doc etc scripts img .gitignore README.md .git
 
 ssh:
+	echo -e "\n" >> ~/.ssh/config
 	cat .ssh/config >> ~/.ssh/config
 
 git: