diff --git a/src/main/resources/arsnova.properties.example b/src/main/resources/arsnova.properties.example
index 49b1fa17b28f271f409dc989559e6d8a0e92741c..8c43c2b650fe99caad4825007fcfb07e8c36940d 100644
--- a/src/main/resources/arsnova.properties.example
+++ b/src/main/resources/arsnova.properties.example
@@ -194,6 +194,10 @@ feedback.cleanup=10
 # maximal filesize in bytes
 upload.filesize_b=1048576
 
+# maximal thumbnail size in pixels
+imageupload.thumbnail.width=200
+imageupload.thumbnail.height=200
+
 # maximal number of answer options allowed for a skill question
 question.answer-option-limit=8