diff --git a/Documentation/UserManual/manual.tex b/Documentation/UserManual/manual.tex
index 45c1acf..e911d9d 100644
--- a/Documentation/UserManual/manual.tex
+++ b/Documentation/UserManual/manual.tex
@@ -1238,7 +1238,7 @@ This marker type is only available for through measurements.
 \subsubsection{TOI/IP3}
 \screenshot{1.0}{MarkerTOIGraph.png}
 \screenshot{1.0}{MarkerTOITable.png}
-This marker type calculates the third-order intercept point. It is only available in spectrum analyzer mode. Initially a peak search is executed to find the two highest peaks. The frequencies of the intermodulation products are calculated from these peak frequencies and helper markers placed on each of these frequencies. Finally, the third-order intercept point as well as the tone and distortion signal amplitudes are calculated.
+This marker type calculates the third-order intercept point. It is only available in spectrum analyzer mode. Initially a peak search is executed to find the two highest peaks. Helper markers suffixed with "p", that show these peaks, are added to the parent marker. These helper markers show up on the graph and in the marker dock by clicking the expand/collapse arrow to the left of the marker #. The frequencies of the intermodulation products are calculated from the two peak helper markers and a new helper marker is placed at each of these frequencies. One suffixed "l" to the left of the first peak and one suffixed "r" to the right of the second peak. Finally, the third-order intercept point as well as the tone and distortion signal amplitudes are calculated.
 \subsubsection{Phase noise}
 \screenshot{1.0}{MarkerPhasenoiseGraph.png}
 \screenshot{1.0}{MarkerPhasenoiseTable.png}