diff --git a/application/Espo/Modules/Crm/Resources/i18n/en_US/KnowledgeBaseArticle.json b/application/Espo/Modules/Crm/Resources/i18n/en_US/KnowledgeBaseArticle.json
index cd74f90a3d..b7f2160837 100644
--- a/application/Espo/Modules/Crm/Resources/i18n/en_US/KnowledgeBaseArticle.json
+++ b/application/Espo/Modules/Crm/Resources/i18n/en_US/KnowledgeBaseArticle.json
@@ -33,6 +33,9 @@
             "Article": "Article"
         }
     },
+    "tooltips": {
+        "portals": "If not empty then this article will be available only in specified portals. If empty then it will available in all portals."
+    },
     "presetFilters": {
         "published": "Published"
     }
diff --git a/application/Espo/Modules/Crm/Resources/metadata/entityDefs/KnowledgeBaseArticle.json b/application/Espo/Modules/Crm/Resources/metadata/entityDefs/KnowledgeBaseArticle.json
index 9816b081ee..2566e2e86c 100644
--- a/application/Espo/Modules/Crm/Resources/metadata/entityDefs/KnowledgeBaseArticle.json
+++ b/application/Espo/Modules/Crm/Resources/metadata/entityDefs/KnowledgeBaseArticle.json
@@ -20,7 +20,8 @@
             "options": ["Article"]
         },
         "portals": {
-            "type": "linkMultiple"
+            "type": "linkMultiple",
+            "tooltip": true
         },
         "publishDate": {
             "type": "date"
diff --git a/application/Espo/Modules/Crm/SelectManagers/KnowledgeBaseArticle.php b/application/Espo/Modules/Crm/SelectManagers/KnowledgeBaseArticle.php
index 2e6274f152..7fbdbf550e 100644
--- a/application/Espo/Modules/Crm/SelectManagers/KnowledgeBaseArticle.php
+++ b/application/Espo/Modules/Crm/SelectManagers/KnowledgeBaseArticle.php
@@ -46,9 +46,14 @@ class KnowledgeBaseArticle extends \Espo\Core\SelectManagers\Base
             $this->filterPublished($result);
 
             $this->setDistinct(true, $result);
-            $this->addJoin('portals', $result);
-            $this->addAndWhere(array(
-                'portals.id' => $this->getUser()->get('portalId')
+            $this->addLeftJoin('portals', $result);
+            $this->addOrWhere(array(
+                array(
+                    'portals.id' => $this->getUser()->get('portalId')
+                ),
+                array(
+                    'portals.id' => null
+                )
             ), $result);
         }
     }