Topic: To update value in line, prompt where I

Table structure:

ID int PRIMARY KEY NOT NULL IDENTITY (1,1), serial_ID bigint, ne_cont float, he_cont float,"
"h_cont float, n_cont float, oar_cont float, enter_time text, fill_time text, out_time text,"
"mass float, volume float, pressure float, fill_temp float, annotation text

I want to update value last line of the table

UPDATE dbo.ne_he_archive SET annotation = normal WHERE ID = (SELECT MAX (ID) FROM dbo.ne_he_archive)

In the answer I receive that normal is a column name
[quote =] Invalid column name ' normal '.

I can not understand why it considers the data for a column, a column name...