diff --git a/Functions.md b/Functions.md
index c4952a8..b383c37 100644
--- a/Functions.md
+++ b/Functions.md
@@ -114,4 +114,26 @@ $result = my_function($param1, $param2);
 
 </div></details><br>
 
-_Reference_: [`Generic.Functions.FunctionCallArgumentSpacing`](https://github.com/squizlabs/PHP_CodeSniffer/blob/master/src/Standards/Generic/Sniffs/Functions/FunctionCallArgumentSpacingSniff.php)
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+_Reference_: [`Generic.Functions.FunctionCallArgumentSpacing`](https://github.com/squizlabs/PHP_CodeSniffer/blob/master/src/Standards/Generic/Sniffs/Functions/FunctionCallArgumentSpacingSniff.php)
+
+# Do not add spaces after opening or before closing bracket
+
+Parenthesis must tightly enclose parameters.
+
+<details><summary>Example</summary><div><br>
+
+**Bad**
+
+```PHP
+if( $condition ) { ... }
+```
+
+**Good**
+
+```PHP
+if($condition) { ... }
+```
+
+</div></details><br>
+
+_Reference_: [`PSR2.ControlStructures.ControlStructureSpacing`](https://github.com/squizlabs/PHP_CodeSniffer/blob/master/src/Standards/PSR2/Sniffs/ControlStructures/ControlStructureSpacingSniff.php)
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