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-rw-r--r--src/core/or/circuitlist.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/src/core/or/circuitlist.h b/src/core/or/circuitlist.h
index fd7e22e4c0..bd4a117e26 100644
--- a/src/core/or/circuitlist.h
+++ b/src/core/or/circuitlist.h
@@ -114,9 +114,12 @@
#define CIRCUIT_PURPOSE_S_HSDIR_POST 20
#define CIRCUIT_PURPOSE_S_HS_MAX_ 20
-/** A testing circuit; not meant to be used for actual traffic. */
+/** A testing circuit; not meant to be used for actual traffic. It is used for
+ * bandwidth measurement, reachability test and address discovery from an
+ * authority using the NETINFO cell. */
#define CIRCUIT_PURPOSE_TESTING 21
-/** A controller made this circuit and Tor should not use it. */
+/** A controller made this circuit and Tor should not cannibalize it or attach
+ * streams to it without explicitly being told. */
#define CIRCUIT_PURPOSE_CONTROLLER 22
/** This circuit is used for path bias probing only */
#define CIRCUIT_PURPOSE_PATH_BIAS_TESTING 23