diff --git a/library/intel.dcm b/library/intel.dcm
index fb4bd271..08d40d94 100644
--- a/library/intel.dcm
+++ b/library/intel.dcm
@@ -125,6 +125,7 @@ $ENDCMP
 $CMP 82C54_PLCC
 D 82C54, Triple Channel Timer/Counter, PLCC-28
 K Timer Counter
+F http://download.intel.com/design/archives/periphrl/docs/23124406.pdf
 $ENDCMP
 #
 $CMP 82C55A