diff --git a/README.md b/README.md
index cfba11ca..ae40d4ae 100644
--- a/README.md
+++ b/README.md
@@ -28,8 +28,9 @@ Install
 * Add the content of file `dot.htaccess` to the `.htaccess` file in the directory
   you want to be styled (you might have to create this file). This directory and any subdirectories will be
   styled by h5ai.
-* Optionally add `h5ai.header.html` and/or `h5ai.footer.html` files to any of the styled folders to [display custom
-  top or bottom sections](http://repo.larsjung.de/h5ai-sample/customize). The content of those files will be wrapped by `<header>` and `<footer>` tags.
+* Optionally add `h5ai.header.html` and/or `h5ai.footer.html` files to any of the styled folders to [display
+  custom top or bottom sections](http://repo.larsjung.de/h5ai-sample/customize). The content of those files
+  will be wrapped by `<header>` and `<footer>` tags.
 
 
 Changelog
diff --git a/dot.htaccess b/dot.htaccess
index f86ee241..77754c6b 100644
--- a/dot.htaccess
+++ b/dot.htaccess
@@ -1,9 +1,29 @@
+################################
+# customized .htaccess for h5ai
+################################
+
+
+# Options  +Indexes
+# Options  +FollowSymLinks
+
+
+################################
+# cache images for 52 weeks
+################################
+
+<IfModule mod_headers.c>
+	<FilesMatch "\.png$">
+		Header set Cache-Control "max-age=31449600, public"
+	</FilesMatch>
+</IfModule>
+
+
+################################
+# style auto index
+################################
 
 <IfModule mod_autoindex.c>
 
-	# Options              +Indexes
-
-
 	################################
 	# uncomment the following line to force directory listing
 	# even for directories with valid index files
diff --git a/h5ai/main.css b/h5ai/main.css
index f5cf0c92..f370fab9 100644
--- a/h5ai/main.css
+++ b/h5ai/main.css
@@ -52,6 +52,8 @@ body > nav a {
 	padding: 0 10px;
 }
 body > nav img {
+	width: 16px;
+	height: 16px;
 	vertical-align: bottom;
 	padding: 0 6px 6px 0;
 }