README: Document how to deal with stale build cache

nextstrain · May 24, 2019 · 4e29c80 · 4e29c80
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@@ -175,6 +175,10 @@ To update the API documentation after adding or removing an augur submodule, aut
 
     sphinx-apidoc -T -f -o docs augur
 
+Sphinx caches built documentation by default, which is generally great, but can cause the sidebar of pages to be stale.  You can clean out the cache with:
+
+    make -C docs clean
+
 ## License and copyright
 
 Copyright 2014-2019 Trevor Bedford and Richard Neher.