diff --git a/src/SQLiteC++/Database.h b/src/SQLiteC++/Database.h
index 6406684..f583956 100644
--- a/src/SQLiteC++/Database.h
+++ b/src/SQLiteC++/Database.h
@@ -67,6 +67,8 @@ public:
      * @param[in] apQueries  one or multiple UTF-8 encoded, semicolon-separate SQL statements
      *
      * @return number of changes made by those SQL statements
+     *
+     * @throw SQLite::Exception in case of error
      */
     int exec(const char* apQueries); // throw(SQLite::Exception);
 
@@ -84,6 +86,10 @@ public:
      * @see also Statement class for handling queries with multiple results
      *
      * @param[in] apQuery  an UTF-8 encoded SQL query
+     *
+     * @return a temporary Column object with the first column of result.
+     *
+     * @throw SQLite::Exception in case of error
      */
     Column execAndGet(const char* apQuery); // throw(SQLite::Exception);
 
@@ -93,6 +99,10 @@ public:
      *  Table names are case sensitive.
      *
      * @param[in] apTableName an UTF-8 encoded case sensitive Table name
+     *
+     * @return true if the table exists.
+     *
+     * @throw SQLite::Exception in case of error
      */
     bool tableExists(const char* apTableName); // throw(SQLite::Exception);
 
diff --git a/src/SQLiteC++/Statement.h b/src/SQLiteC++/Statement.h
index 5e33997..4b20a49 100644
--- a/src/SQLiteC++/Statement.h
+++ b/src/SQLiteC++/Statement.h
@@ -114,12 +114,14 @@ public:
     /**
      * @brief Execute a step of the query to fetch one row of results.
      *
+     * @see Database::exec() is a shortcut to execute one or multiple statements without results
+     *
      * @return - true  (SQLITE_ROW)  if there is another row ready : you can call getColumn(N) to get it
      *                               then you have to call executeStep() again to fetch more rows until the query is finished
      *         - false (SQLITE_DONE) if the query has finished executing : there is no (more) row of result
      *                               (case of a query with no result, or after N rows fetched successfully)
      *
-     * @see Database::exec() is a shortcut to execute one or multiple statements without results
+     * @throw SQLite::Exception in case of error
      */
     bool executeStep(void); // throw(SQLite::Exception);
 
diff --git a/src/example1/main.cpp b/src/example1/main.cpp
index 2a76c30..bf960a4 100644
--- a/src/example1/main.cpp
+++ b/src/example1/main.cpp
@@ -156,9 +156,26 @@ int main (void)
 
         db.exec("CREATE TABLE test (id INTEGER PRIMARY KEY, value TEXT)");
 
+        // first row
         int nb = db.exec("INSERT INTO test VALUES (NULL, \"test\")");
         std::cout << "INSERT INTO test VALUES (NULL, \"test\")\", returned " << nb << std::endl;
 
+        // second row
+        nb = db.exec("INSERT INTO test VALUES (NULL, \"second\")");
+        std::cout << "INSERT INTO test VALUES (NULL, \"second\")\", returned " << nb << std::endl;
+
+        // update the second row
+        nb = db.exec("UPDATE test SET value=\"second-updated\" WHERE id='2'");
+        std::cout << "UPDATE test SET value=\"second-updated\" WHERE id='2', returned " << nb << std::endl;
+
+        // Check the results : expect two row of result
+        SQLite::Statement   query(db, "SELECT * FROM test");
+        std::cout << "SELECT * FROM test :\n";
+        while (query.executeStep())
+        {
+            std::cout << "row : (" << query.getColumn(0) << ", " << query.getColumn(1) << ")\n";
+        }
+
         db.exec("DROP TABLE test");
     }
     catch (std::exception& e)
@@ -216,14 +233,13 @@ int main (void)
             std::cout << "SQLite exception: " << e.what() << std::endl;
         }
 
-        // Check the results
+        // Check the results (expect only one row of result, as the second one has been rollbacked by the error)
         SQLite::Statement   query(db, "SELECT * FROM test");
         std::cout << "SELECT * FROM test :\n";
         while (query.executeStep())
         {
             std::cout << "row : (" << query.getColumn(0) << ", " << query.getColumn(1) << ")\n";
         }
-
     }
     catch (std::exception& e)
     {