diff --git a/style.tex b/style.tex
index f6d7643..ffbc962 100644
--- a/style.tex
+++ b/style.tex
@@ -86,6 +86,7 @@
 \newcommand{\fmodegloss}{\glossary{name={failure mode},description={The way in which a failure occurs. A component or sub-system may fail in a number of ways, and each of these is a 
 failure mode of the component or sub-system}}}
 \newcommand{\fmeagloss}{\glossary{name={FMEA}, description={Failure Mode and Effects analysis (FMEA) is a process where each potential failure mode within a SYSTEM, is analysed to determine SYSTEM level failure modes, and  to then classify them {\wrt} percieved severity}}}
+\newcommand{\frategloss}{\glossary{name={failure rate}, description={The number of failure within a population (of size N), divided by N over a given time interval}}}
 
 
 
diff --git a/survey/survey.tex b/survey/survey.tex
index 696cdc4..49f0a49 100644
--- a/survey/survey.tex
+++ b/survey/survey.tex
@@ -333,6 +333,7 @@ part number, environmental stress factors, MTTF, safe/dangerous etc.
 The product failure rate is the sum of all component
 failure rates.  Typically the sum of all MTTF rates for all
 components in an FMEDA spreadsheet.
+\frategloss
 %This is the sum of safe and unsafe
 %failures.
 
@@ -838,7 +839,7 @@ Discuss hardware failsafes (good example over pressure saefty values).
 Keep relating these back to bayes theorem.
 
 \subsection{Deterministic FMEA}
-# FMEA cannot handle simultaneous failure modes.....
+........... FMEA cannot handle simultaneous failure modes.....
 EN298 no two individual component failures may give rise to a dangerous condition.