[docs] Add note RE: persistence to GenerateRandomKey

1 files changed, 4 insertions, 0 deletions

diff --git a/securecookie.go b/securecookie.go
index 61af390..a34f851 100644
--- a/securecookie.go
+++ b/securecookie.go
@@ -506,6 +506,10 @@ func decode(value []byte) ([]byte, error) {
 // GenerateRandomKey creates a random key with the given length in bytes.
 // On failure, returns nil.
 //
+// Note that keys created using `GenerateRandomKey()` are not automatically
+// persisted. New keys will be created when the application is restarted, and
+// previously issued cookies will not be able to be decoded.
+//
 // Callers should explicitly check for the possibility of a nil return, treat
 // it as a failure of the system random number generator, and not continue.
 func GenerateRandomKey(length int) []byte {