diff --git a/README.md b/README.md
index df177db..0499d2a 100644
--- a/README.md
+++ b/README.md
@@ -66,3 +66,7 @@ Faster alternative (no Inf/NaN handling) to the std::complex implementation.
 
 Mixed-radix [decimation-in-time](https://en.wikipedia.org/wiki/Cooley%E2%80%93Tukey_FFT_algorithm) [fast Fourier transform](https://en.wikipedia.org/wiki/Fast_Fourier_transform)
 
+### [utils.hh](utils.hh)
+
+Some everyday helpers, like the [signum function](https://en.wikipedia.org/wiki/Sign_function).
+
diff --git a/utils.hh b/utils.hh
new file mode 100644
index 0000000..a0549ec
--- /dev/null
+++ b/utils.hh
@@ -0,0 +1,21 @@
+/*
+Some little helpers
+
+Copyright 2018 Ahmet Inan <inan@aicodix.de>
+*/
+
+#ifndef UTILS_HH
+#define UTILS_HH
+
+namespace DSP {
+
+template <typename TYPE>
+int signum(TYPE v)
+{
+	return (v > TYPE(0)) - (v < TYPE(0));
+}
+
+}
+
+#endif
+