diff --git a/src/ocrmypdf/_pipeline.py b/src/ocrmypdf/_pipeline.py
index d9cc87fd..67482ffb 100644
--- a/src/ocrmypdf/_pipeline.py
+++ b/src/ocrmypdf/_pipeline.py
@@ -518,6 +518,7 @@ def rasterize(
                 device_idx = at_least('png16m')
 
     if pageinfo.has_vector:
+        log.debug("Page has vector content, using png16m")
         device_idx = at_least('png16m')
 
     device = colorspaces[device_idx]