diff --git a/src/ifcpatch/ifcpatch/recipes/RegenerateGlobalIds.py b/src/ifcpatch/ifcpatch/recipes/RegenerateGlobalIds.py
index 9556c38544..947efbfa1a 100644
--- a/src/ifcpatch/ifcpatch/recipes/RegenerateGlobalIds.py
+++ b/src/ifcpatch/ifcpatch/recipes/RegenerateGlobalIds.py
@@ -54,18 +54,27 @@ class Patcher:
 
     def patch(self):
         if self.only_duplicates:
+            duplicates = 0
+            invalid_ids = 0
+
             guids = set()
             for element in self.file.by_type("IfcRoot"):
                 if element.GlobalId in guids:
                     element.GlobalId = ifcopenshell.guid.new()
+                    duplicates += 1
                 elif len(element.GlobalId) != 22 or element.GlobalId[0] not in "0123":
                     element.GlobalId = ifcopenshell.guid.new()
+                    invalid_ids += 1
                 else:
                     try:
                         ifcopenshell.guid.expand(element.GlobalId)
                     except:
                         element.GlobalId = ifcopenshell.guid.new()
+                    invalid_ids += 1
                 guids.add(element.GlobalId)
+
+            print("Replaced %s duplicate GlobalIds" % duplicates)
+            print("Replaced %s invalid GlobalIds" % invalid_ids)
         else:
             for element in self.file.by_type("IfcRoot"):
                 element.GlobalId = ifcopenshell.guid.new()