diff --git a/FAQ.md b/FAQ.md
index c165373..c609ae6 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -159,7 +159,7 @@ From the code, it keeps 31 log files only, so it won't fill up your disk.
 
 https://github.com/rustdesk/hbb_common/blob/900077a2c2651336317f8094ea44074c48acd2a4/src/lib.rs#L407
 
-```
+```rust
                      .rotate(
 
                          Criterion::Age(Age::Day),