diff --git a/contrib/ban_words/main.php b/contrib/ban_words/main.php
new file mode 100644
index 00000000..9f6ef176
--- /dev/null
+++ b/contrib/ban_words/main.php
@@ -0,0 +1,57 @@
+<?php
+/**
+ * Name: Comment Word Ban
+ * Author: Shish <webmaster@shishnet.org>
+ * Link: http://trac.shishnet.org/shimmie2/
+ * License: GPLv2
+ * Description: For stopping spam and other comment abuse
+ */
+
+class BanWords extends Extension {
+	public function receive_event($event) {
+		if(is_a($event, 'InitExtEvent')) {
+			global $config;
+			$config->set_default_string('banned_words', "
+viagra
+porn
+			");
+		}
+
+		if(is_a($event, 'CommentPostingEvent')) {
+			global $config;
+			$banned = $config->get_string("banned_words");
+			$comment = strtolower($event->comment);
+			
+			foreach(explode("\n", $banned) as $word) {
+				$word = trim(strtolower($word));
+				if(strlen($word) == 0) {
+					// line is blank
+					continue;
+				}
+				else if($word[0] == '/') {
+					// lines that start with slash are regex
+					if(preg_match($word, $comment)) {
+						$event->veto("Comment contains banned terms");
+						break;
+					}
+				}
+				else {
+					// other words are literal
+					if(strpos($comment, $word) !== false) {
+						$event->veto("Comment contains banned terms");
+						break;
+					}
+				}
+			}
+		}
+
+		if(is_a($event, 'SetupBuildingEvent')) {
+			$sb = new SetupBlock("Banned Phrases");
+			$sb->add_label("One per line, lines that start with slashes are treated as regex");
+			$sb->add_longtext_option("banned_words");
+			$event->panel->add_block($sb);
+		}
+	}
+}
+add_event_listener(new BanWords(), 30); // before the comment is added
+?>