diff --git a/docs/how-to/how-to-change-log-level-on-the-fly.md b/docs/how-to/how-to-change-log-level-on-the-fly.md
index dcbb4f5fd9..30839f33ce 100644
--- a/docs/how-to/how-to-change-log-level-on-the-fly.md
+++ b/docs/how-to/how-to-change-log-level-on-the-fly.md
@@ -4,13 +4,13 @@
 
 example:
 ```bash
-curl --data "trace;flow=debug" 127.0.0.1:4000/debug/log_level
+curl --data "trace,flow=debug" 127.0.0.1:4000/debug/log_level
 ```
 And database will reply with something like:
 ```bash
-Log Level changed from Some("info") to "trace;flow=debug"%
+Log Level changed from Some("info") to "trace,flow=debug"%
 ```
 
-The data is a string in the format of `global_level;module1=level1;module2=level2;...` that follow the same rule of `RUST_LOG`. 
+The data is a string in the format of `global_level,module1=level1,module2=level2,...` that follow the same rule of `RUST_LOG`. 
 
 The module is the module name of the log, and the level is the log level. The log level can be one of the following: `trace`, `debug`, `info`, `warn`, `error`, `off`(case insensitive).
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