diff --git a/pkg/cmd/plugin_update.go b/pkg/cmd/plugin_update.go
index 8f1fd30d0..f85978a3b 100644
--- a/pkg/cmd/plugin_update.go
+++ b/pkg/cmd/plugin_update.go
@@ -36,11 +36,13 @@ type pluginUpdateOptions struct {
 
 const pluginUpdateDesc = `Update one or more Helm plugins.
 
-An exact version can be supplied per-plugin using the @version syntax:
+An exact semver version can be supplied per-plugin using the @version syntax:
 
     helm plugin update myplugin@1.2.3 otherplugin@2.0.0
     helm plugin update myplugin@v1.0.0
 
+Range constraints (e.g. ~1.2, ^1.0.0, >=1.0.0) are not supported.
+
 If no version is given for a plugin it is updated to the latest version:
 
     helm plugin update myplugin otherplugin