diff --git a/.gitignore b/.gitignore
index 71d5a1b..9c628ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,6 +28,7 @@ videos/
 
 # Machine-specific notes, CI runner setup, local experiments, benchmark automation (kept locally, never published)
 /private/
+/external/
 # Claude Code local settings
 /.claude/
 # Native kernel build products and inputs extracted from NVIDIA's DLL at build time