diff --git a/utilities/utilities.plugin.zsh b/utilities/utilities.plugin.zsh
index 357b65d..d0d5d0a 100644
--- a/utilities/utilities.plugin.zsh
+++ b/utilities/utilities.plugin.zsh
@@ -43,6 +43,24 @@ notify() {
   tmux-dcs-passthrough '\x1b]9;'"$*"'\x7'
 }
 
+# Send a desktop notification when long running commands complete.
+notify_command_threshold=60
+notify-preexec() {
+  notify_command_start=`date +%s`
+  notify_command=$1
+}
+notify-precmd() {
+  if ! [[ -z $notify_command_start ]]; then
+    local notify_command_end=`date +%s`
+    local notify_command_time=$(($notify_command_end - $notify_command_start))
+    if [[ $notify_command_time -gt $notify_command_threshold ]]; then
+      notify "completed: $notify_command"
+    fi
+  fi
+}
+add-zsh-hook preexec notify-preexec
+add-zsh-hook precmd notify-precmd
+
 # Detect the type and extract an archive file.
 extract() {
   if [ -f $1 ]; then