diff --git a/include/bw_buf.h b/include/bw_buf.h
index dbe82c4..7e249dc 100644
--- a/include/bw_buf.h
+++ b/include/bw_buf.h
@@ -20,13 +20,18 @@
 
 /*!
  *  module_type {{{ utility }}}
- *  version {{{ 0.3.0 }}}
+ *  version {{{ 0.4.0 }}}
  *  requires {{{ bw_config bw_common }}}
  *  description {{{
  *    Common operations on buffers.
  *  }}}
  *  changelog {{{
  *    <ul>
+ *      <li>Version <strong>0.4.0</strong>:
+ *        <ul>
+ *          <li>Added `bw_buf_add()`.</li>
+ *        </ul>
+ *      </li>
  *      <li>Version <strong>0.3.0</strong>:
  *        <ul>
  *          <li>First release.</li>
@@ -46,6 +51,13 @@ extern "C" {
 #endif
 
 /*! api {{{
+ *    #### bw_buf_add()
+ *  ```>>> */
+static inline void bw_buf_add(float *dest, const float *src, float k, int n_elems);
+/*! <<<```
+ *    Adds `k` to the first `n_elems` in `src` and stores the results in the
+ *    first `n_elems` of `dest`.
+ *
  *    #### bw_buf_scale()
  *  ```>>> */
 static inline void bw_buf_scale(float *dest, const float *src, float k, int n_elems);
@@ -73,6 +85,11 @@ static inline void bw_buf_mul(float *dest, const float *src1, const float *src2,
 /* WARNING: This part of the file is not part of the public API. Its content may
  * change at any time in future versions. Please, do not use it directly. */
 
+static inline void bw_buf_add(float *dest, const float *src, float k, int n_elems) {
+	for (int i = 0; i < n_elems; i++)
+		dest[i] = k + src[i];
+}
+
 static inline void bw_buf_scale(float *dest, const float *src, float k, int n_elems) {
 	for (int i = 0; i < n_elems; i++)
 		dest[i] = k * src[i];