diff --git a/config.php b/config.php
index 95314e6..5c31aaa 100644
--- a/config.php
+++ b/config.php
@@ -113,6 +113,13 @@
 
 define('AUTOLINK_PAGE_TITLES', false);
 
+// COLORIZE_MISSING_PAGES
+//
+// Automatically highlights as red links, any linked pages which are
+// not yet written. Existing but blank pages are not colorized. This
+// might degrade performance if you have thousands of links on a page.
+
+define('COLORIZE_MISSING_PAGES', true);
 
 // -----------------------------
 // Security and session settings
diff --git a/index.css b/index.css
index 4443f61..3225c4d 100644
--- a/index.css
+++ b/index.css
@@ -149,6 +149,10 @@ a.tool {
 	color: #eeeeee;
 }
 
+a.missing-link {
+	color: #ba0000;
+}
+
 input.tool {
 	font-size: 11px;
 	color: #000000;
diff --git a/index.php b/index.php
index e1313ac..64f97c4 100644
--- a/index.php
+++ b/index.php
@@ -84,7 +84,18 @@
 
 function _handle_links($match)
 {
-	return "<a href=\"" . SELF . VIEW . "/" . htmlentities($match[1]) . "\">" . htmlentities($match[1]) . "</a>";
+	$link = $match[1];
+	if ( COLORIZE_MISSING_PAGES ) {
+		$link_page = sanitizeFilename($link);
+		$link_filename = PAGES_PATH . "/$link_page.txt";
+		$link_page_exists = file_exists($link_filename);
+	} else {
+		$link_page_exists = true;
+	}
+	if ($link_page_exists)
+		return "<a href=\"" . SELF . VIEW . "/" . htmlentities($link) . "\">" . htmlentities($link) . "</a>";
+	else
+		return "<a href=\"" . SELF . VIEW . "/" . htmlentities($link) . "\" class=\"missing-link\">" . htmlentities($link) . "</a>";
 }