diff --git a/documentation/API-design-guidelines.md b/documentation/API-design-guidelines.md
index b2e59e0c..a649eb11 100644
--- a/documentation/API-design-guidelines.md
+++ b/documentation/API-design-guidelines.md
@@ -936,13 +936,19 @@ As filtering may reveal sensitive information, privacy and security constraints
 
 And according to the filtering based on string and enums data, being searched for: 
 
-
 | **Operation** |	**Strings/enums** |
 | ----- | ----- |
 | equal | `GET .../?type=mobile` |
 | non equal | `GET .../?type!=mobile` |
 | Contains | `GET .../?type=~str` |
 
+For boolean parameters the filter can be set for True or False value:
+
+| **Operation** | 	**Booleans**    |
+|---------------|-----------------------|
+| True          | `GET .../?boolAttr=true`  |
+| False         | `GET .../?boolAttr=false` |
+
 **Additional rules**:
 - The operator "`&`" is evaluated as an AND between different attributes.
 - A Query Param (attribute) can contain one or n values separated by "`,`".