Honor configurable cache size with LRU eviction

README.md

@@ -67,6 +67,19 @@ The fixed source blacklist is:
 
 Client error reports never modify this list.
 
+## Cache resizing
+
+`CACHE_MAX_BYTES` is the worker's configurable LRU limit. After changing it and
+restarting the container:
+
+- A smaller value evicts the oldest unlocked entries until usage fits.
+- A larger value immediately makes the additional capacity available for
+  background population, up to the size of the mounted cache filesystem.
+
+The host filesystem is deliberately separate from application logic. Enlarge or
+shrink its preallocated image during infrastructure maintenance, then set the
+matching `CACHE_MAX_BYTES` value in Coolify.
+
 ## Playback locking
 
 - An active movie locks that movie.