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-rw-r--r--doc/user/rtmon.t3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/user/rtmon.t b/doc/user/rtmon.t
index 5744bcae86..fa6ac9437a 100644
--- a/doc/user/rtmon.t
+++ b/doc/user/rtmon.t
@@ -1147,7 +1147,8 @@ procedure Rate_Monotonic_Period (
@code{SUCCESSFUL} - period initiated successfully@*
@code{INVALID_ID} - invalid rate monotonic period id@*
@code{NOT_OWNER_OF_RESOURCE} - period not created by calling task@*
-@code{NOT_DEFINED} - period has never been initiated@*
+@code{NOT_DEFINED} - period has never been initiated (only
+possible when period is set to PERIOD_STATUS)@*
@code{TIMEOUT} - period has expired
@subheading DESCRIPTION: