diff --git a/contrib/keyword.zsh b/contrib/keyword.zsh
new file mode 100644
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--- /dev/null
+++ b/contrib/keyword.zsh
@@ -0,0 +1,63 @@
+#!/usr/bin/env zsh
+# -------------------------------------------------------------------------------------------------
+# Copyright (c) 2010-2011 zsh-syntax-highlighting contributors
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification, are permitted
+# provided that the following conditions are met:
+#
+#  * Redistributions of source code must retain the above copyright notice, this list of conditions
+#    and the following disclaimer.
+#  * Redistributions in binary form must reproduce the above copyright notice, this list of
+#    conditions and the following disclaimer in the documentation and/or other materials provided
+#    with the distribution.
+#  * Neither the name of the zsh-syntax-highlighting contributors nor the names of its contributors
+#    may be used to endorse or promote products derived from this software without specific prior
+#    written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# -------------------------------------------------------------------------------------------------
+# -*- mode: zsh; sh-indentation: 2; indent-tabs-mode: nil; sh-basic-offset: 2; -*-
+# vim: ft=zsh sw=2 ts=2 et
+# -------------------------------------------------------------------------------------------------
+
+# A simple keyword highlighting extension for zsh-syntax-highlighting.
+
+# To use this, please do the following steps.
+# 1) Source this file after zsh-syntax-highlighting.zsh
+# % source zsh-syntax-highlighting.zsh
+# % source contrib/keyword.zsh
+# 2) Add keyword and color pairs to `ZSH_HIGHLIGHT_KEYWORD_KEYWORDS`.
+# % ZSH_HIGHLIGHT_KEYWORD_KEYWORDS+=('rm -rf *' 'fg=white,bold,bg=red')
+# 3) Please see the effect.
+# % ;# rm -rf /tmp/doesnotexist
+
+# List of keyword and color pairs.
+typeset -gA ZSH_HIGHLIGHT_KEYWORD_KEYWORDS
+
+_zsh_highlight-keyword() {
+  setopt localoptions extendedglob
+  for pattern in ${(k)ZSH_HIGHLIGHT_KEYWORD_KEYWORDS}; do
+    _zsh_highlight-keyword-loop "$BUFFER" "$pattern"
+  done
+}
+
+_zsh_highlight-keyword-loop() {
+  # This does *not* do its job syntactically, sorry.
+  local buf="$1"
+  local pat="$2"
+  local -a match mbegin mend
+  if [[ "$buf" == (#b)(*)(${~pat})* ]]; then
+    region_highlight+=("$((mbegin[2] - 1)) $mend[2] $ZSH_HIGHLIGHT_KEYWORD_KEYWORDS[$pat]")
+    "$0" "$match[1]" "$pat"; return $?
+  fi
+}
+
+_zsh_add-highlighter _zsh_highlight-keyword _zsh_buffer-modified-p