README_EXPORT_TESTS.txt in tracksperanto-2.11.0

- old
+ new
@@ -1,17 +1,24 @@
 Export tests are conformance tests. That means that:
 
-1) An export is made using Tracksperanto
+1) An export is made using Tracksperanto 
 2) This export gets checked by importing it into the main app 
 that accepts such files
 3) The export is compared with Tracksperanto output in the test
 
 This means that unless you own an app that accepts this particular format
 you cannot overwrite the export with your own since you got no way to verify
 that the export works
 
-The current test set consists of the two parabolic curves that cross. The second
-parabolic curve goes left, the first one - right, and they start at opposite
-corners of the reference 1920x1080 export. At the first point the track has the residual of 0,
-at the end of the curve - the biggest residual (PFTrack marks it red exactly at the last keyframe).
+The current test set consists of three trackers. First - two two parabolic curves that cross.
+The first tracker goes left to right, the second right to left and they start at opposite
+corners of the reference 1920x1080 export.
 
-In the middle of the curves a couple of keyframes is skipped to verify that proper gaps are written into the export.
+At the first point the track has the residual of 0, at the end of the curve - the biggest 
+residual (PFTrack marks it red exactly at the last keyframe).
+
+The third tracker has one keyframe and is positioned exactly in the middle.
+
+In the middle of the curves a couple of keyframes is skipped to verify that proper gaps are written into the export.
+
+When changing the export parameters you will need to overwrite all test exports, to do so set the environment variable
+called TRACKSPERANTO_OVERWRITE_ALL_TEST_DATA
\ No newline at end of file