diff --git a/doc/tutorial/basics/fieldcomp.md b/doc/tutorial/basics/fieldcomp.md
index 6723413..1f42a30 100644
--- a/doc/tutorial/basics/fieldcomp.md
+++ b/doc/tutorial/basics/fieldcomp.md
@@ -34,11 +34,11 @@
 shanghai: {
     pos:     2
     name:    "Shanghai"
-    nameLen: 9
+    nameLen: 8
 }
 munich: {
     pos:     3
     name:    "Munich"
-    nameLen: 9
+    nameLen: 6
 }
-```
\ No newline at end of file
+```