bea0dd2ca02cdb2c6cc88f2478aafe87a743f42a

 1diff --git a/plugins/mix/_mix b/plugins/mix/_mix
 2index 656c7fe19d5e8725075ec6a1788332d8aa260cd5..346fc8c4f5099c22edf3bc559d2f19a882473c64 100644
 3--- a/plugins/mix/_mix
 4+++ b/plugins/mix/_mix
 5@@ -146,6 +146,16 @@ case $state in
 6       (help)
 7          _arguments ':feature:__task_list'
 8          ;;
 9+      (format)
10+        _arguments -C \
11+          '--check-formatted' \
12+          '--dot-formatter' \
13+          '--dry-run' \
14+          '--force' \
15+          '--migrate' \
16+          '--no-exit' \
17+          '*::file:_files'
18+          ;;
19       (test)
20          _files
21          ;;