diff --git a/squiggle.h b/squiggle.h
index 8fe507e..d0cec35 100644
--- a/squiggle.h
+++ b/squiggle.h
@@ -30,7 +30,7 @@ double array_std(double* array, int length);
 // Mixture function
 double sample_mixture(double (*samplers[])(uint64_t*), double* weights, int n_dists, uint64_t* seed);
 
-// Trick to mute unused variable warning. Useful for nested functions
+// Macro to mute "unused variable" warning when -Wall -Wextra is enabled. Useful for nested functions
 #define UNUSED(x) (void)(x)
 
 #endif