diff --git a/src/vector.c b/src/vector.c
index b86a0e0..423c2ba 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -699,6 +699,7 @@ vector_add(PG_FUNCTION_ARGS)
 	for (int i = 0, imax = a->dim; i < imax; i++)
 		rx[i] = ax[i] + bx[i];
 
+	/* Check for overflow */
 	for (int i = 0, imax = a->dim; i < imax; i++)
 	{
 		if (isinf(rx[i]))
@@ -734,6 +735,7 @@ vector_sub(PG_FUNCTION_ARGS)
 	for (int i = 0, imax = a->dim; i < imax; i++)
 		rx[i] = ax[i] - bx[i];
 
+	/* Check for overflow */
 	for (int i = 0, imax = a->dim; i < imax; i++)
 	{
 		if (isinf(rx[i]))