diff --git a/files/tmux.conf b/files/tmux.conf
index 688cbe9..4f1df90 100644
--- a/files/tmux.conf
+++ b/files/tmux.conf
@@ -1,5 +1,10 @@
 set -g default-terminal "tmux-256color"
 set -ag terminal-overrides ",*:RGB"
+# Forward modified keys (Shift+Enter etc.) to apps inside tmux — lets Claude Code
+# take Shift+Enter for multi-line prompts (its /terminal-setup can't run in tmux).
+# Needs a terminal that sends them (Ghostty does); mobile falls back to \ + Return.
+set -s extended-keys on
+set -as terminal-features "xterm*:extkeys"
 set -g default-shell /usr/bin/fish
 set -g mouse on
 set -g set-clipboard on