Improve documentation

README.md

@@ -161,7 +161,7 @@ $parser = Parser::new()->tableHeader(['rank', 'team', 'winner']);
 
 **Because its a tabular data each cell MUST be unique otherwise an exception will be thrown**
 
-### includSection and excludeSection
+### includeSection and excludeSection
 
 Tells which section should be parsed based on the `Section` enum
 
@@ -173,6 +173,9 @@ $parser = Parser::new()->includeSection(Section::tfoot); // tfoot is included du
 $parser = Parser::new()->excludeSection(Section::tr);    // table direct tr children are not included during parsing
 ```
 
+**By default, the `thead` section is not parse. If a `thead` row is selected to be the header, it will
+be parsed independently of this setting.**
+
 ### ignoreXmlErrors and failOnXmlErrors
 
 Tells whether the parser should ignore or throw in case of malformed HTML content.