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diff --git a/README.md b/README.md
index 657fab3..c8bf1ed 100644
--- a/README.md
+++ b/README.md
@@ -185,6 +185,7 @@ $ ponzu upgrade
 ### add, a
 
 Downloads an addon to GOPATH/src and copys it to the Ponzu project's ./addons directory.
+Must be called from within a Ponzu project directory.
 
 Example:
 ```bash