diff --git a/tests/FILEFORMAT b/tests/FILEFORMAT
index 6b48382c05..c1d50721e4 100644
--- a/tests/FILEFORMAT
+++ b/tests/FILEFORMAT
@@ -125,6 +125,10 @@ this creates the named file with this content before the test case is run
 which is useful if the test case needs a file to act on.
 </file>
 
+<stdin>
+Pass this given data on stdin to the tool.
+</stdin>
+
 </client>
 
 <verify>