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-rw-r--r--common/chapters/control_if.adoc2
1 files changed, 1 insertions, 1 deletions
diff --git a/common/chapters/control_if.adoc b/common/chapters/control_if.adoc
index ea55cd7..cd639c7 100644
--- a/common/chapters/control_if.adoc
+++ b/common/chapters/control_if.adoc
@@ -55,7 +55,7 @@ The fields specified below follow the following meaning:
<id>::
A numeric identifier, uniquely identifying this particular
- operation. `0` is not allowed. It will be echoed back in any
+ operation. Value `0` is not allowed unless it's a TRAP message. It will be echoed back in any
response to a particular request.
<var>::
The name of the variable / field affected by the GET / SET /