diff --git a/docs/en/unit/tvoc.md b/docs/en/unit/tvoc.md
index 1196b9a3..587b32c8 100644
--- a/docs/en/unit/tvoc.md
+++ b/docs/en/unit/tvoc.md
@@ -1,4 +1,4 @@
-# TVOC
+# TVOC/eCO2
 
 <el-tag effect="plain">SKU:U088</el-tag>