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-rw-r--r--GNUmakefile3
1 files changed, 3 insertions, 0 deletions
diff --git a/GNUmakefile b/GNUmakefile
index 2c172da6..9d02c6ba 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -26,6 +26,9 @@
 
 # Debugging techniques:
 #
+#   When a test (make check ...) fails, the incorrect output is in the file
+#   TESTNAME.out in /tmp/netpbm-test/ .
+#
 #   To build so you can easily debug with a debugger such as Gdb:
 #
 #     make CFLAGS="-g -O0"