1 files changed, 3 insertions, 0 deletions
diff --git a/HACKING b/HACKING
index 6da0e5941..96cb3a924 100644
--- a/HACKING
+++ b/HACKING
@@ -178,6 +178,9 @@
 * Use `keep_testdirs=yes' to keep test directories for successful
   tests also.
 
+* Use perl coverage information to ensure your new code is thoroughly
+  tested by your new tests.
+
 * See file `tests/README' for more information.
 
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