diff --git a/configure.ac b/configure.ac
index f2cb6ddf..c3f4d3ee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -399,8 +399,6 @@ AS_IF([test "x$EMSCRIPTEN" = "x" -a "$host_os" != "pnacl"], [
 #pragma GCC target("avx2")
 #include <immintrin.h>
 ]], [[
-// the code below is intentionally crafted to make sure the compiler
-// can't optimize the AVX2 instructions away.
 __m256 x = _mm256_set1_ps(3.14);
 __m256 y = _mm256_permutevar8x32_ps(x, _mm256_set1_epi32(42));
 return _mm256_movemask_ps(_mm256_cmp_ps(x, y, _CMP_NEQ_OQ));