diff --git a/bash/prompt b/bash/prompt
index d4a8c40..388f7d1 100644
--- a/bash/prompt
+++ b/bash/prompt
@@ -92,6 +92,9 @@ prompt_build_simple() {
         [[ -n "$action" ]] && echo -n "$action"
     fi
 
+    set_color -p yellow
+    [[ -n "${IN_NIX_SHELL}" ]] && echo -n " nix"
+
     # close prompt
     set_color -p none
     echo -n '> '
diff --git a/shell/nix b/shell/nix
new file mode 100755
index 0000000..0f921c6
--- /dev/null
+++ b/shell/nix
@@ -0,0 +1,5 @@
+if [ -e /Users/lloeki/.nix-profile/etc/profile.d/nix.sh ]; then . /Users/lloeki/.nix-profile/etc/profile.d/nix.sh; fi
+
+#if [[ -e '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh' ]]; then
+#  . '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh'
+#fi
diff --git a/zsh/prompt b/zsh/prompt
index e39eaaa..22af2be 100644
--- a/zsh/prompt
+++ b/zsh/prompt
@@ -168,6 +168,8 @@ set_prompt() {
         [[ -n "$action" ]] && buffer="${buffer} %F{yellow}$action"
     fi
 
+    [[ -n "${IN_NIX_SHELL}" ]] && buffer="${buffer} %F{yellow}nix"
+
     buffer="${buffer}%f> "
     PROMPT="${buffer}"
 }