diff --git a/doc/ui/cmd_argument/detail_introduction.md b/doc/ui/cmd_argument/detail_introduction.md
index 40c6f5d2d87404a683337629df6a10575598e595..af97e04d54135bfd41fc1ac4c81af45486803dff 100644
--- a/doc/ui/cmd_argument/detail_introduction.md
+++ b/doc/ui/cmd_argument/detail_introduction.md
@@ -110,7 +110,7 @@
   - type: int32 (default: -1).
 
 * `--test_period_while_training`
-  - Run test every test_period_while_training batches while doing training. If not 0, test log_period batches, if 0 test nothing.
+  - Run test every test_period_while_training batches while doing training. If not 0, test log_period batches, if 0, test nothing.
   - type: int32 (default: 0).
 
 * `--test_wait`