diff --git a/src/main/java/xyz/zhouxy/plusone/commons/jdbc/SimpleJdbcTemplate.java b/src/main/java/xyz/zhouxy/plusone/commons/jdbc/SimpleJdbcTemplate.java
index fb0925f..51d274f 100644
--- a/src/main/java/xyz/zhouxy/plusone/commons/jdbc/SimpleJdbcTemplate.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/jdbc/SimpleJdbcTemplate.java
@@ -233,7 +233,7 @@ public class SimpleJdbcTemplate {
         }
 
         public <T extends Exception> void tx(final IAtom<T> atom) throws SQLException, T {
-            Assert.notNull(atom, "Tx can not be null.");
+            Assert.notNull(atom, "Atom can not be null.");
             try {
                 this.conn.setAutoCommit(false);
                 atom.execute();