diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index 4678e5985..5001e8055 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -9,6 +9,7 @@
 * #659 Idempotent DELETE by ids, optimizing performance
 * #660 Builders: auto-detect multi-column IDs
 * #662 Update expression parser with JavaCC 7.0.13
+* #673 OpenAPI should have an "array of string" schema for "include" and "exclude"
 
 ## Release 5.0.M19
 
diff --git a/agrest-jaxrs3-openapi/src/main/java/io/agrest/jaxrs3/openapi/parmconverter/UriInfoResolver.java b/agrest-jaxrs3-openapi/src/main/java/io/agrest/jaxrs3/openapi/parmconverter/UriInfoResolver.java
index 66b10aad4..e6363e8bf 100644
--- a/agrest-jaxrs3-openapi/src/main/java/io/agrest/jaxrs3/openapi/parmconverter/UriInfoResolver.java
+++ b/agrest-jaxrs3-openapi/src/main/java/io/agrest/jaxrs3/openapi/parmconverter/UriInfoResolver.java
@@ -5,6 +5,7 @@
 import io.agrest.protocol.Direction;
 import io.swagger.v3.jaxrs2.ResolvedParameter;
 import io.swagger.v3.oas.models.Operation;
+import io.swagger.v3.oas.models.media.ArraySchema;
 import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.media.StringSchema;
 import io.swagger.v3.oas.models.parameters.Parameter;
@@ -81,12 +82,11 @@ public ResolvedParameter resolve() {
     }
 
     protected Parameter createIncludeParam() {
-        // TODO: detailed schema
-        return queryParam(ControlParams.include);
+        return queryParam(ControlParams.include).schema(new ArraySchema().items(new StringSchema()));
     }
 
     protected Parameter createExcludeParam() {
-        return queryParam(ControlParams.exclude);
+        return queryParam(ControlParams.exclude).schema(new ArraySchema().items(new StringSchema()));
     }
 
     protected Parameter createSortParam() {