1 files changed, 6 insertions, 1 deletions
diff --git a/em.awk b/em.awk
index c956fa1..2cc6a74 100644
--- a/em.awk
+++ b/em.awk
@@ -1,9 +1,13 @@
 #!/usr/bin/awk -f
 
+### em.awk
+# list of physical EM constants
+
+
 BEGIN {
     ARGV[1] ? OFMT = "%." ARGV[1] "g" : OFMT = "%.12g"
 
-    ### constants
+    # constants
     pi = 4.0*atan2(1,1)         # rad
     c0 = 299792458E0            # m/s, exact
     mu0 = (4.0E-7)*pi           # H/m = (T*m)/A = N/(A^2) = (kg*m)/(A*s)
@@ -11,3 +15,4 @@ BEGIN {
 
     print pi, c0, mu0, epsilon0
 }
+