diff --git a/openapi.yaml b/openapi.yaml
index 7a64a925..50033244 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -1666,7 +1666,7 @@ paths:
                     description: >-
                       Version number of the openEO process specification this back-end
                       targets.
-                      If not provided or `null` the version is either unknown or multiple versions are implemented.
+                      If not provided or `null`, the version is either unknown or multiple versions are implemented.
                       Clients must be able to handle multiple process versions at the same time.
                       
                       This is **not** the openEO API specification version.