Clarify enum need at least one entry

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/common-trace-format-specification.txt b/common-trace-format-specification.txt
index 4af2244ab37adfa5a513cff029811cbdcc48bcea..830699ff130ac4757e003d70b71b312f1f8ca2a0 100644 (file)
--- a/common-trace-format-specification.txt
+++ b/common-trace-format-specification.txt
@@ -360,6 +360,7 @@ values to strings.  An enumeration from the C language can be represented in
 this format by having the same start_value and end_value for each element, which
 is in fact a range of size 1. This single-value range is supported without
 repeating the start and end values with the value = string declaration.
+Enumerations need to contain at least one entry.
 
 enum name : integer_type {
   somestring          = start_value1 ... end_value1,