diff --git a/README.md b/README.md
index bb61775..1a37a30 100644
--- a/README.md
+++ b/README.md
@@ -708,7 +708,7 @@ Powerlevel10k does not affect:
 # Add powerlevel10k to the list of Oh My Zsh themes.
 git clone --depth=1 https://github.com/romkatv/powerlevel10k.git $ZSH_CUSTOM/themes/powerlevel10k
 # Replace ZSH_THEME="powerlevel9k/powerlevel9k" with ZSH_THEME="powerlevel10k/powerlevel10k".
-sed 's/powerlevel9k/powerlevel10k/g' -i ~/.zshrc
+sed -i.bak 's/powerlevel9k/powerlevel10k/g' ~/.zshrc
 # Restart Zsh.
 exec zsh
 ```