diff --git a/tests/readme.txt b/tests/readme.txt
index fed58977aa..3db2ad9a38 100644
--- a/tests/readme.txt
+++ b/tests/readme.txt
@@ -37,7 +37,7 @@ target has finished, e.g.
 
   make digest TEST_FPC=path_to_your_compiler
 
-Make sure to clean the test suite between two runs.
+Make sure to clean the test suite between two runs for the same platform.
 
 
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