diff --git a/test/rand/generator/normal.cpp b/test/rand/generator/normal.cpp
index dfb4f7f7..aa38f5cf 100644
--- a/test/rand/generator/normal.cpp
+++ b/test/rand/generator/normal.cpp
@@ -6,6 +6,7 @@
 #include <random>
 
 
+///////////////////////////////////////////////////////////////////////////////
 /// Probability density function for a normal distribution with specified
 /// mean and stddev at point `x`.
 static
@@ -17,6 +18,7 @@ float pdf (float x, float mean, float stddev)
 }
 
 
+///----------------------------------------------------------------------------
 /// Calculate the maximum difference between a histogram and a PDF for a
 /// normal distribution with a number of buckets.
 static
@@ -57,6 +59,7 @@ float max_histogram_error (int buckets)
 }
 
 
+///////////////////////////////////////////////////////////////////////////////
 int main (void)
 {
     cruft::TAP::logger tap;