diff --git a/entity/Activity_entity/Activity_entity.aod b/entity/Activity_entity/Activity_entity.aod
index cc8a09c7a9d235b337a18948546a6e4dd7f8b03c..3a7cefb053135ca4734036d7bcee95cf1a5bc931 100644
--- a/entity/Activity_entity/Activity_entity.aod
+++ b/entity/Activity_entity/Activity_entity.aod
@@ -3,6 +3,7 @@
   <name>Activity_entity</name>
   <title>Activity</title>
   <majorModelMode>DISTRIBUTED</majorModelMode>
+  <documentation>%aditoprj%/entity/Activity_entity/documentation.adoc</documentation>
   <iconId>NEON:HISTORY</iconId>
   <imageProcess>%aditoprj%/entity/Activity_entity/imageProcess.js</imageProcess>
   <recordContainer>db</recordContainer>
@@ -137,7 +138,7 @@
       <expose v="true" />
       <triggerRecalculation v="true" />
       <mandatory v="false" />
-      <description>Nur Eigene anzeigen</description>
+      <documentation>%aditoprj%/entity/Activity_entity/entityfields/onlyinnate_param/documentation.adoc</documentation>
     </entityParameter>
     <entityField>
       <name>DATE_EDIT</name>
@@ -168,7 +169,7 @@
       <expose v="true" />
       <triggerRecalculation v="true" />
       <mandatory v="false" />
-      <description>PARAMETER</description>
+      <documentation>%aditoprj%/entity/Activity_entity/entityfields/objectid_param/documentation.adoc</documentation>
     </entityParameter>
     <entityField>
       <name>ObjectId</name>
diff --git a/entity/Activity_entity/documentation.adoc b/entity/Activity_entity/documentation.adoc
new file mode 100644
index 0000000000000000000000000000000000000000..f904775731a6512f69c2d443b1293a2919e5f31f
--- /dev/null
+++ b/entity/Activity_entity/documentation.adoc
@@ -0,0 +1,5 @@
+= Activity
+
+An activity describes one part of the communication timeline. 
+This could be for example an e-mail or a phone call.
+Every activity can be connected to several other objects like contactpersons, organisations, products, offers, and so on.
diff --git a/entity/Activity_entity/entityfields/objectid_param/documentation.adoc b/entity/Activity_entity/entityfields/objectid_param/documentation.adoc
new file mode 100644
index 0000000000000000000000000000000000000000..004d34fa79b5bd7c213ddd5935ecf9dca4c5ac28
--- /dev/null
+++ b/entity/Activity_entity/entityfields/objectid_param/documentation.adoc
@@ -0,0 +1,3 @@
+The `ObjectId_param`-param specifies the object type of a `RowId_param`.
+For example if you pass a `RELATIONID` [of a contactperson] as `RowId_param` you've to specify the type[the `ObjObjectId_param`] as contactperson.
+
diff --git a/entity/Activity_entity/entityfields/onlyinnate_param/documentation.adoc b/entity/Activity_entity/entityfields/onlyinnate_param/documentation.adoc
new file mode 100644
index 0000000000000000000000000000000000000000..abd18febe748f73d214ba89835a2abf043029c79
--- /dev/null
+++ b/entity/Activity_entity/entityfields/onlyinnate_param/documentation.adoc
@@ -0,0 +1 @@
+The `OnlyInnate_param` specifies a filter where only own records (records you created) are displayed.
\ No newline at end of file