@w{@kbd{C-u C-x =}} displays additional information about a
character, including the character set name and the codes that
identify the character within that character set; ASCII characters are
-identified as belonging to the @code{ASCII} character set. It also
+identified as belonging to the @code{ascii} character set. It also
shows the character's syntax, categories, and encodings both
internally in the buffer and externally if you save the file. It also
shows the character's text properties, if any.