diff --git a/.env.sample b/.env.sample
index 0dd20da..91e67a9 100644
--- a/.env.sample
+++ b/.env.sample
@@ -37,3 +37,7 @@ NEXT_PUBLIC_PROD_DOMAIN=
 # Session
 
 NEXT_PUBLIC_SESSION_URL=
+
+# Signal
+
+NEXT_PUBLIC_SIGNAL_URL=