diff --git a/docs/configuration.md b/docs/configuration.md
index 01cf669..2cd13de 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -76,7 +76,13 @@ scanner_extensions = mp3 ogg
 ## `[webapp]` section
 
 `cache_dir`: directory used to store generated files, such as resized cover
-arts. Defaults to `/tmp/supysonic`.
+art or transcoded files. Defaults to `/tmp/supysonic`.
+
+`cache_size`: maximum size (in megabytes) of the cache (except for trancodes).
+Defaults to 512 MB
+
+`transcode_cache_size`: maximum size (in megabytes) of the transcode cache.
+Defaults to 1024 MB (1 GB)
 
 `log_file`: rotating file where some events generated by the web server are
 logged. Leave empty to disable logging.
@@ -98,6 +104,12 @@ transcoding format. Defaults to `on`.
 ; Optional cache directory. Default: /tmp/supysonic
 cache_dir = /var/supysonic/cache
 
+; Main cache max size in MB. Default: 512
+cache_size = 512
+
+; Transcode cache max size in MB. Default: 1024 (1GB)
+transcode_cache_size = 1024
+
 ; Optional rotating log file. Default: none
 log_file = /var/supysonic/supysonic.log