Updated README

Author: ondrejmirtes

README.md

@@ -9,6 +9,7 @@
 * Require booleans in `if`, `elseif`, ternary operator, after `!`, and on both sides of `&&` and `||`.
 * Functions `in_array` and `array_search` must be called with third parameter `$strict` set to `true` to search values with matching types only.
 * Variables assigned in `while` loop condition and `for` loop initial assignment cannot be used after the loop.
+* Types in `switch` condition and `case` value must match. PHP compares them loosely by default and that can lead to unexpected results.
 
 Additional rules are coming in subsequent releases!
 
@@ -26,3 +27,19 @@ And include rules.neon in your project's PHPStan config:
 includes:
 	- vendor/phpstan/phpstan-strict-rules/rules.neon
 ```
+
+## Enabling rules one-by-one
+
+If you don't want to start using all the available strict rules at once but only one or two, you can! Just don't include the whole `rules.neon` from this package in your configuration, but look at its contents and copy only the rules you want to your configuration:
+
+```
+	-
+		class: PHPStan\Rules\StrictCalls\StrictFunctionCallsRule
+		tags:
+			- phpstan.rules.rule
+
+	-
+		class: PHPStan\Rules\SwitchConditions\MatchingTypeInSwitchCaseConditionRule
+		tags:
+			- phpstan.rules.rule
+```