diff --git a/public/biopet-core/src/main/scala/nl/lumc/sasc/biopet/core/extensions/CheckChecksum.scala b/public/biopet-core/src/main/scala/nl/lumc/sasc/biopet/core/extensions/CheckChecksum.scala
index 79b46d9d35deec4d4d832468006bfc52f1309ba7..0ae2587f7928bb8d8cfe3e157f79fec7afff031a 100644
--- a/public/biopet-core/src/main/scala/nl/lumc/sasc/biopet/core/extensions/CheckChecksum.scala
+++ b/public/biopet-core/src/main/scala/nl/lumc/sasc/biopet/core/extensions/CheckChecksum.scala
@@ -32,6 +32,8 @@ class CheckChecksum extends InProcessFunction {
 
     if (outputChecksum != checksum.toLowerCase) {
       logger.error(s"Input file: '$inputFile' md5sum is not as expected, aborting pipeline")
+
+      // 130 Simulates a ctr-C
       Runtime.getRuntime.halt(130)
     }
   }