diff --git a/serde/json/serializer.nim b/serde/json/serializer.nim
index 3185e1b..db9d2e6 100644
--- a/serde/json/serializer.nim
+++ b/serde/json/serializer.nim
@@ -102,11 +102,13 @@ proc `%`*[T: object or ref object](obj: T): JsonNode =
     case mode
     of OptIn:
       if not hasSerialize:
+        debug "object field not marked with serialize, skipping"
         skip = true
       elif opts.ignore:
         skip = true
     of OptOut:
       if opts.ignore:
+        debug "object field opted out of serialization ('ignore' is set), skipping"
         skip = true
       elif hasSerialize and opts.key == name: # all serialize params are default
         warn "object field marked as serialize in OptOut mode, but 'ignore' not set, field will be serialized"