diff --git a/documentation20/en/05.insert/docs.md b/documentation20/en/05.insert/docs.md
index f55ba42c89d9577f32abde4a3282e9cf0b694b54..87deacf91ef9053e5a324527ab50bb9ca28deb31 100644
--- a/documentation20/en/05.insert/docs.md
+++ b/documentation20/en/05.insert/docs.md
@@ -50,7 +50,7 @@ measurement,tag_set field_set timestamp
 
 * measurement is used as the table name. Comma delimiter is used to separate measurement and tag_set.
 * tag_set represent tag data in key-value pairs. The format is: `<tag_key>=<tag_value>,<tag_key>=<tag_value>`. Comma delimiter is used to separate multiple tag key-value pairs. Space delimiter is used to separate tag_set and field_set.
-* field_set represent column data in key-value pairs. The format is similar to tag_set: `<field_key>=<field_value>,<field_key>=<field_value>`. Comma delimiter is used to separate multiple tag key-value pairs。Space delimiter is used to separate field_set and timestamp.
+* field_set represent column data in key-value pairs. The format is similar to tag_set: `<field_key>=<field_value>,<field_key>=<field_value>`. Comma delimiter is used to separate multiple tag key-value pairs. Space delimiter is used to separate field_set and timestamp.
 * Timestamp is the primary key of one data row.
 
 All tag values in tag_set are automatically converted and stored as NCHAR data type in TDengine and no need to be surrounded by double quote("）