diff --git a/DEPLOYING.md b/DEPLOYING.md
index b07e12f..d82a8c8 100644
--- a/DEPLOYING.md
+++ b/DEPLOYING.md
@@ -16,6 +16,9 @@ sudo pip install {{path}}/python/crankshaft --upgrade
 cd {{path}}/pg && sudo PGUSER=postgres make all install
 ```
 
+Caveat: note that `pip install ./crankshaft` will install
+from local files, but `pip install crankshaft` will not.
+
 Installing the extension in user databases:
 
 ...