diff --git a/rowers/templates/workoutstats.html b/rowers/templates/workoutstats.html
index 965a54f8..3b1fbc5b 100644
--- a/rowers/templates/workoutstats.html
+++ b/rowers/templates/workoutstats.html
@@ -86,7 +86,9 @@
     <span class="tooltiptext">
       <p>rPower: Equivalent steady state power for the duration of the workout.</p>
       <p>Heart Rate Drift: Comparing heart rate normalized for average power for the first and second half of the workout</p>
+      <p>TRIMP: TRaining IMPact. A way to combine duration and heart rate into a single number.</p>
       <p>rScore: Score based on rPower and workout duration to estimate training effect</p>
+      <p>rScore (HR): Score based on heart rate, designed to give values comparable to rScore. Used instead of rScore for workouts without power data.</p>
     </span>
   <h2>Other Stats</h2>
   <table width="100%" class="listtable">