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-rw-r--r--mysql-test/collections/README8
1 files changed, 8 insertions, 0 deletions
diff --git a/mysql-test/collections/README b/mysql-test/collections/README
index 9af84646a40..f64c089ee99 100644
--- a/mysql-test/collections/README
+++ b/mysql-test/collections/README
@@ -28,3 +28,11 @@ these steps:
5) The commands from the collection are run line by line via execv() or
similar system calls. They are not run as a shell script. Shell
expansions are not guaranteed to work and most likely won't.
+
+The directory may contain collections that are "super sets" of others,
+identified by a file name suffix ".in". These files may contain lines
+"#include <filename>", or lines with mysql-test-run.pl invocations.
+CMake will create a new file without the .in suffix where
+the include lines are replaced with the contents of the referred
+file. Filename is local to the collections directory, and includes do
+not nest.