diff --git a/commands/hugo.go b/commands/hugo.go
index 64befed1d..986036e7a 100644
--- a/commands/hugo.go
+++ b/commands/hugo.go
@@ -83,7 +83,7 @@ func init() {
 	HugoCmd.PersistentFlags().BoolVar(&DisableRSS, "disableRSS", false, "Do not build RSS files")
 	HugoCmd.PersistentFlags().BoolVar(&DisableSitemap, "disableSitemap", false, "Do not build Sitemap file")
 	HugoCmd.PersistentFlags().StringVarP(&Source, "source", "s", "", "filesystem path to read files relative from")
-	HugoCmd.PersistentFlags().StringVarP(&CacheDir, "cacheDir", "", "$TMPDIR/hugo_cache/", "filesystem path to cache directory")
+	HugoCmd.PersistentFlags().StringVarP(&CacheDir, "cacheDir", "", "", "filesystem path to cache directory. Defaults: $TMPDIR/hugo_cache/")
 	HugoCmd.PersistentFlags().BoolVarP(&IgnoreCache, "ignoreCache", "", false, "Ignores the cache directory for reading but still writes to it")
 	HugoCmd.PersistentFlags().StringVarP(&Destination, "destination", "d", "", "filesystem path to write files to")
 	HugoCmd.PersistentFlags().StringVarP(&Theme, "theme", "t", "", "theme to use (located in /themes/THEMENAME/)")