GmCapsule [main]

Note about parallel caches

=> d17e4e2f7b576ed13d3bdb3cc5816a930cad2283

diff --git a/gmcapsule/gemini.py b/gmcapsule/gemini.py
index 4744387..ce4edd2 100644
--- a/gmcapsule/gemini.py
+++ b/gmcapsule/gemini.py
@@ -252,6 +252,10 @@ class Cache:
     Cache objects have been installed, the save/load operation is attempted
     on each in turn until one cache succeeds in saving or loading content.
 
+    Each server worker thread constructs their own Cache objects. If there
+    is a shared backing store like a file system or a database, proper care
+    should be taken to synchronize access to it from the Cache objects.
+
     The mapping from URLs to cache paths is::
 
         gemini://example.com/path/file.gmi