diff --git a/types/features/features.go b/types/features/features.go
index 9e463c43a..c6269ca63 100644
--- a/types/features/features.go
+++ b/types/features/features.go
@@ -16,6 +16,7 @@ type Features struct {
 
 	// MountOptions is the list of the recognized mount options, e.g., "ro".
 	// Nil value means "unknown", not "no support for any mount option".
+	// This list does not contain filesystem-specific options passed to mount(2) syscall as (const void *).
 	MountOptions []string `json:"mountOptions,omitempty"`
 
 	// Linux is specific to Linux.