1 files changed, 2 insertions, 2 deletions
diff --git a/fir_window_gaussian.awk b/fir_window_gaussian.awk
index 14ebc48..cf2dd12 100644
--- a/fir_window_gaussian.awk
+++ b/fir_window_gaussian.awk
@@ -1,7 +1,7 @@
 #!/usr/bin/awk -f
 
 ### fir_window_gaussian.awk
-# generate a Gaussian window
+# generate a Gaussian FIR window
 # https://en.wikipedia.org/wiki/Window_function
 
 
@@ -21,7 +21,7 @@ BEGIN {
 
     # window interval goes from -M to M
     M = 0.5*(N - 1)
-    pi = 4*atan2(1,1)
+    pi = 4.0*atan2(1.0, 1.0)
 
     for (n=0; n<N; n++) {
         if (N > 1 && M > 0) {