diff --git a/SEL32/sel32_chan.c b/SEL32/sel32_chan.c
index 38762ce..37fef3a 100644
--- a/SEL32/sel32_chan.c
+++ b/SEL32/sel32_chan.c
@@ -1,3 +1,4 @@
+/* sel32_chan.c: SEL 32 Channel functions.
 
    Copyright (c) 2018-2021, James C. Bevier
    Portions provided by Richard Cornwell, Geert Rolf and other SIMH contributers