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-rw-r--r--doc/protocol2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/protocol b/doc/protocol
index 2273f40..5d2cb65 100644
--- a/doc/protocol
+++ b/doc/protocol
@@ -1,5 +1,5 @@
<command> ::= <opcode> " " <args> "\n"
-<response> ::= <retval> "\n"
+<response> ::= (<retval>|"nack") "\n"
Echo:
<opcode> ::= "e"