Describe a few things better with comments

config/conf.d/default.conf

@@ -34,6 +34,7 @@ server {
         include fastcgi_params;
     }
 
+    # Set the cache-control headers on assets to cache for 5 days
     location ~* \.(jpg|jpeg|gif|png|css|js|ico|xml)$ {
         expires 5d;
     }

config/nginx.conf

@@ -33,12 +33,13 @@ http {
     fastcgi_hide_header X-Powered-By;
     server_tokens off;
 
+    # Enable gzip compression by default
     gzip on;
     gzip_proxied any;
     gzip_types text/plain application/xml text/css text/js text/xml application/x-javascript text/javascript application/json application/xml+rss;
     gzip_vary on;
     gzip_disable "msie6";
 
-    # Include other server configs
+    # Include server configs
     include /etc/nginx/conf.d/*.conf;
 }