diff --git a/Instrument/AMDA/Rosetta/LAP.xml b/Instrument/AMDA/Rosetta/LAP.xml
index cb51bf1..e93aba8 100644
--- a/Instrument/AMDA/Rosetta/LAP.xml
+++ b/Instrument/AMDA/Rosetta/LAP.xml
@@ -7,7 +7,27 @@
       <ResourceName>LAP</ResourceName>
       <AlternateName>Langmuir Probe</AlternateName>
       <ReleaseDate>2009-05-20T21:10:13Z</ReleaseDate>
-      <Description></Description>
+      <Description> The ESA Rosetta mission to comet 67P/Churyumov-Gerasimenko carried a small but 
+        comprehensive set of plasma instruments known as the Rosetta Plasma Consortium (RPC), 
+        monitoring the cometary plasma from arrival in August 2014 to end of mission in September 
+        2016. Among the RPC instruments was the Langmuir probe instrument LAP, with chief 
+        mission to measure:   
+        * Plasma density, ne
+        * Spacecraft potential, Vsc
+        * Electron temperature, Te
+        * Electric field, E
+        * Ion flow speed, ui
+        * Photoemission current, Iph
+        * Wave activity
+        
+        The LAP sensors are two spherical probes, 5 cm in diameter, known as LAP1 and LAP2, one 
+on each of the two booms protruding a few meters from the s/c body. The primary 
+parameters actually measured by the instrument is the current flowing to (or the voltage of) 
+the probes when some bias voltage (or bias current) is applied to it, which are the data 
+transmitted to ground. From these data the parameters above have been derived, for some 
+products also with use of data from RPC-MIP. Do not expect all parameters to be available at 
+any given time.
+      </Description>
       <Contact>       
          <PersonID>spase://CDPP/Person/Anders.Eriksson</PersonID>
         <Role>PrincipalInvestigator</Role> 
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