diff --git a/表达式函数.md b/表达式函数.md
index 0de5d93..d37abe9 100644
--- a/表达式函数.md
+++ b/表达式函数.md
@@ -135,6 +135,7 @@ FreeParse 是提供给外部的解析工具，它拥有 FreeSql 所有表达式
 | - | - | - | - | - | - |
 | string.Empty | '' | '' | '' | '' |
 | string.IsNullOrEmpty(a) | (a is null or a = '') | (a is null or a = '') | (a is null or a = '') | (a is null or a = '') | (a is null or a = '') |
+| string.Concat(a,b,c...) | concat(a, b, c) | a + b + c | a \|\| b \|\| c | a \|\| b \|\| c | a \|\| b \|\| c |
 | a.CompareTo(b) | strcmp(a, b) | - | case when a = b then 0 when a > b then 1 else -1 end | case when a = b then 0 when a > b then 1 else -1 end | case when a = b then 0 when a > b then 1 else -1 end |
 | a.Contains('b') | a like '%b%' | a like '%b%' | a ilike'%b%' | a like '%b%' | a like '%b%' |
 | a.EndsWith('b') | a like '%b' | a like '%b' | a ilike'%b' | a like '%b' | a like '%b' |