diff --git a/affiliations-tools/v1/rnsr/json.ini b/affiliations-tools/v1/rnsr/json.ini
index ede0e8a..a3970ce 100644
--- a/affiliations-tools/v1/rnsr/json.ini
+++ b/affiliations-tools/v1/rnsr/json.ini
@@ -1,4 +1,5 @@
 # OpenAPI Documentation - JSON format (dot notation)
+mimeType = application/json
 post.responses.default.description = Return a JSON, composed of `id`, `value`, where value is found `RNSR`(s)
 post.responses.default.content.application/json.schema.$ref = #/components/IdRNSRs
 post.summary = Find RNSR to address given in `value`, when possible