diff --git a/NI_PCI6602.md b/NI_PCI6602.md
index 8114275..f37cdf0 100644
--- a/NI_PCI6602.md
+++ b/NI_PCI6602.md
@@ -5,12 +5,18 @@ The basic functions of Pixelator are implemented on the [NI PCI6602](https://www
 The NI PCI6602 card provides the clock that governs the measurement dwell time and triggers detectors, often referred to as the "pixel clock". These are constructed from the first 3 subdevices (of 8 total) using the following external connections (pins grouped into the same function are connected).
 
 <table>
-<tr><td> Function </td><td> Pin </td><td> Name </td></tr>
-<tr><td rowspan=2>?</td><td> 3 </td><td> C0 Gate </td></tr>
+<tr><td> Function </td><td> NI PCI6602 Pin </td><td> Name </td></tr>
+<tr><td rowspan=2>Clock Switch?</td><td> 3 </td><td> C0 Gate </td></tr>
 <tr><td> 32 </td><td> C2 Out </td></tr>
 <tr><td rowspan=2>Line Time</td><td> 5 </td><td> C0 Out </td></tr>
 <tr><td> 8 </td><td> C1 Gate </td></tr>
-<tr><td rowspan=6>Counter Trigger</td><td> 9 </td><td> C1 Out </td></tr>
+<tr><td rowspan=1>Pixel Clock</td><td> 9 </td><td> C1 Out </td></tr>
+</table>
+
+For additional functions:
+<table>
+<tr><td> Function </td><td> NI PCI6602 Pin </td><td> Name </td></tr>
+<tr><td rowspan=6>Counter Trigger</td><td> 9 </td><td> C1 Out (pixel clock)</td></tr>
 <tr><td> 64 </td><td> C3 Gate </td></tr>
 <tr><td> 61 </td><td> C4 Gate </td></tr>
 <tr><td> 58 </td><td> C5 Gate </td></tr>
@@ -19,5 +25,5 @@ The NI PCI6602 card provides the clock that governs the measurement dwell time a
 <tr><td rowspan=2>Window Trigger</td><td> 67 </td><td> C2 Gate </td></tr>
 <tr><td> - </td><td> Analog Output card pin PO.0 </td></tr>
 <tr><td rowspan=2>Beam Shutter</td><td> 10 </td><td> PO.0 </td></tr>
-<tr><td> - </td><td> Analog Output card pin PO.0 </td></tr>
+<tr><td> - </td><td> Beam shutter controller </td></tr>
 </table>
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