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diff --git a/btt/doc/btt.tex b/btt/doc/btt.tex
index aa7db8c..eb4d29a 100644
--- a/btt/doc/btt.tex
+++ b/btt/doc/btt.tex
@@ -809,6 +809,7 @@ Usage: btt 2.05
[ -i <input name> | --input-file=<input name> ]
[ -I <output name> | --iostat=<output name> ]
[ -l <output name> | --d2c-latencies=<output name> ]
+[ -L <freq> | --periodic-latencies=<freq> ]
[ -m <output name> | --seeks-per-second=<output name> ]
[ -M <dev map> | --dev-maps=<dev map>
[ -o <output name> | --output-file=<output name> ]
@@ -907,6 +908,12 @@ Usage: btt 2.05
This option instructs \texttt{btt} to generate the D2C latency file
discussed in section~\ref{sec:lat-d2c}.
+\subsection{\label{sec:o-L}\texttt{--periodic-latencies}/\texttt{-L}}
+
+ When given a value greater than 0, this option will create two data
+ files (q2c \& d2c) per device containing a periodic timestamp \&
+ average latency over that period.
+
\subsection{\label{sec:o-m}\texttt{--seeks-per-second}\texttt{-m}}
Tells \texttt{btt} to output seeks per second information. Each device