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-rw-r--r--doc/developer-guidelines.sgml3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/developer-guidelines.sgml b/doc/developer-guidelines.sgml
index d7b7a773..6b6f7357 100644
--- a/doc/developer-guidelines.sgml
+++ b/doc/developer-guidelines.sgml
@@ -347,7 +347,8 @@
<listitem><para>min and max are not required if UOM=%</para>
</listitem>
<listitem><para>value, min and max in class [-0-9.]. Must all be the
- same UOM</para>
+ same UOM. value may be a literal "U" instead, this would indicate that the
+ actual value couldn't be determined</para>
</listitem>
<listitem><para>warn and crit are in the range format (see
<xref linkend="thresholdformat">). Must be the same UOM</para>