diff --git a/README.md b/README.md
index 5752bd9..47bda3b 100644
--- a/README.md
+++ b/README.md
@@ -145,7 +145,7 @@ Strongly recommend to use
 ;; Whether display `lsp' state or not. Non-nil to display in mode-line.
 (setq doom-modeline-lsp t)
 
-;; Whether display github notifications or not.
+;; Whether display github notifications or not. Requires `ghub+` package.
 (setq doom-modeline-github t)
 
 ;; The interval of checking github.
diff --git a/doom-modeline.el b/doom-modeline.el
index a74e827..3d26b59 100644
--- a/doom-modeline.el
+++ b/doom-modeline.el
@@ -128,7 +128,7 @@ The icons may not be showed correctly in terminal and on Windows.")
   "Whether display `lsp' state or not. Non-nil to display in mode-line.")
 
 (defvar doom-modeline-github t
-  "Whether display github notifications or not.")
+  "Whether display github notifications or not. Requires `ghub+' package.")
 
 (defvar doom-modeline-github-interval (* 30 60)
   "The interval of checking github.")