diff --git a/.env.example b/.env.example
index 7f40dbf..db3911e 100644
--- a/.env.example
+++ b/.env.example
@@ -68,6 +68,12 @@ VITE_APP_NAME="${APP_NAME}"
 NATIVEPHP_APP_ID=com.simonhamp.devnull
 NATIVEPHP_APP_VERSION="DEBUG"
 NATIVEPHP_APP_VERSION_CODE="1"
+
+# The PHP binaries come from this branch of NativePHP/php-bin-mobile until
+# NativePHP/php-bin-mobile#46 is released. It grows the buffers that carry a
+# screen to Swift and Kotlin, so a screen of more than about 3,250 nodes
+# isn't dropped.
+NATIVEPHP_BIN_BRANCH=fix/grow-flat-buffer
 # dev-null.sh sends sign-ins back to devnull://auth/callback. NativePHP's auth
 # session reads the scheme from this file, so it has to be set here.
 NATIVEPHP_DEEPLINK_SCHEME=devnull