1 files changed, 8 insertions, 0 deletions
diff --git a/cache.h b/cache.h
index 49b083ee0..c74b73671 100644
--- a/cache.h
+++ b/cache.h
@@ -446,6 +446,14 @@ static inline enum object_type object_type(unsigned int mode)
 #define GIT_QUARANTINE_ENVIRONMENT "GIT_QUARANTINE_PATH"
 
 /*
+ * Environment variable used in handshaking the wire protocol.
+ * Contains a colon ':' separated list of keys with optional values
+ * 'key[=value]'.  Presence of unknown keys and values must be
+ * ignored.
+ */
+#define GIT_PROTOCOL_ENVIRONMENT "GIT_PROTOCOL"
+
+/*
  * This environment variable is expected to contain a boolean indicating
  * whether we should or should not treat:
  *