diff --git a/.config/shell/p10k/simple.p10k.zsh b/.config/shell/p10k/simple.p10k.zsh
index a709cde..93c1d04 100644
--- a/.config/shell/p10k/simple.p10k.zsh
+++ b/.config/shell/p10k/simple.p10k.zsh
@@ -60,10 +60,15 @@
   typeset -g POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS=(
     # command_execution_time  # previous command duration
     # virtualenv              # python virtual environment
+    nix_shell                 # nix shell
     # context                 # user@host
     time                      # current time
   )
 
+  #[ nix_shell: nix shell (https://nixos.org/nixos/nix-pills/developing-with-nix-shell.html) ]##
+  # Nix shell color.
+  typeset -g POWERLEVEL9K_NIX_SHELL_FOREGROUND=4
+
   # Basic style options that define the overall prompt look.
   typeset -g POWERLEVEL9K_BACKGROUND=                            # transparent background
   typeset -g POWERLEVEL9K_{LEFT,RIGHT}_{LEFT,RIGHT}_WHITESPACE=  # no surrounding whitespace