diff --git a/plugin/plugin.go b/plugin/plugin.go
index 35e618747..1ff569699 100644
--- a/plugin/plugin.go
+++ b/plugin/plugin.go
@@ -5,7 +5,12 @@ type Environment struct {
 	// Path to the IPFS repo.
 	Repo string
 
-	// The plugin's config, if specified.
+	// The plugin's config, if specified in the
+	// Plugins.Plugins["plugin-name"].Config field of the user's go-ipfs
+	// config. See docs/plugins.md for details.
+	//
+	// This is an arbitrary JSON-like object unmarshaled into an interface{}
+	// according to https://golang.org/pkg/encoding/json/#Unmarshal.
 	Config interface{}
 }