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@@ -32,7 +32,8 @@ using namespace std;
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  * There are two kinds of messages:
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  *  - Array messages. These are just a list of strings, and the message
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  *    itself has a specific length. The contained strings may not
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- *    contain NUL characters (<tt>'\\0'</tt>).
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+ *    contain NUL characters (<tt>'\\0'</tt>). Note that an array message
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+ *    must have at least one element.
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  *  - Scalar messages. These are byte strings which may contain arbitrary
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  *    binary data. Scalar messages also have a specific length.
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  * The protocol is designed to be low overhead, easy to implement and