diff --git a/README.md b/README.md
index edf2317..c759583 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,13 @@ A number of command line parameters are available to configure the application.
 | REDIS_PORT                |           | 6379                                        |                                                   | The port on which the Redis instance is available                                                                                            |
 | REDIS_URL                 | \*        |                                             | http://example.com/redis                          | The url under which the Redis instance is available                                                                                          |
 
+### Custom ontologies
+
+Using the `OTHER_OWL_URLS` environment parameter, custom ontologies can be added to the inference of the database. For performance and data integrity reasons they need to conform to the following rules:
+
+1. Build on the [NAMPI core ontology](http://purl.org/nampi/owl/core) with regards to the core entities like `person`, `event`, `act` or `aspect`
+2. Only use rules compatible with the OWL Micro reasoner as described in the [Apache Jena inference documentation](https://jena.apache.org/documentation/inference/#OWLcoverage)
+
 ## Deploying as a standalone Spring Boot application
 
 The application can be run from the command line using Maven, the environment parameters can be appended to the command.
@@ -139,7 +146,3 @@ Access Token Endpoint: `[Keycloak URL]/realms/nampi/protocol/openid-connect/toke
 
 Authorization Endpoint: `[Keycloak URL]/auth/realms/nampi/protocol/openid-connect/auth`
 Access Token Endpoint: `[Keycloak URL]/auth/realms/nampi/protocol/openid-connect/token`
-
-## API use
-
-Note: Comma in Literals need to be URL Encoded to %2C: instead of `Lastname, Firstname@en`, `Lastname%2C Firstname@en` needs to be used.
diff --git a/inf_cache.ttl b/inf_cache.ttl
index bb1e641..d6f7ac8 100644
--- a/inf_cache.ttl
+++ b/inf_cache.ttl
@@ -55,7 +55,7 @@ tdb2:DatasetTDB2  rdfs:subClassOf  ja:RDFDataset .
 :model_inf a ja:InfModel ;
      ja:baseModel :graph ;
      ja:reasoner [
-         ja:reasonerURL <http://jena.hpl.hp.com/2003/OWLFBRuleReasoner>
+         ja:reasonerURL <http://jena.hpl.hp.com/2003/OWLMicroFBRuleReasoner>
      ] .
 
 :graph rdf:type tdb2:GraphTDB ;
diff --git a/pom.xml b/pom.xml
index 416a966..feec11a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,7 +9,7 @@
   </parent>
   <groupId>eu.nampi</groupId>
   <artifactId>backend</artifactId>
-  <version>0.4.2</version>
+  <version>0.5.0</version>
   <name>nampi-backend</name>
   <description>The NAMPI backend</description>