diff --git a/src/transcript.rs b/src/transcript.rs
index 9973f0b..42e2013 100644
--- a/src/transcript.rs
+++ b/src/transcript.rs
@@ -332,6 +332,18 @@ impl TranscriptRngBuilder {
         self.strobe.meta_ad(b"rng", false);
         self.strobe.key(&random_bytes, false);
 
+        TranscriptRng {
+            strobe: self.strobe,
+        }
+    }
+    pub fn finalize_trng(mut self,trng: &[u8]) -> TranscriptRng
+    {
+        let mut random_bytes = [0u8; 32];
+        random_bytes.copy_from_slice(&trng[..]);
+
+        self.strobe.meta_ad(b"rng", false);
+        self.strobe.key(&random_bytes, false);
+
         TranscriptRng {
             strobe: self.strobe,
         }