diff --git a/.gitignore b/.gitignore
index 903564d19..a2682cbc1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,11 @@
 /target/
 target/
 
+# Feature cache (precomputed .fxcache binaries, ~470MB each)
+test_data/feature-cache/
+/data/feature-cache/
+*.fxcache
+
 # IDE files
 .vscode/
 .idea/