https://bugzilla.gnome.org/show_bug.cgi?id=696015
* @text: zero-terminated string with base64 text to decode
* @out_len: (out): The length of the decoded data is written here
*
- * Decode a sequence of Base-64 encoded text into binary data
+ * Decode a sequence of Base-64 encoded text into binary data. Note
+ * that the returned binary data is not necessarily zero-terminated,
+ * so it should not be used as a character string.
*
* Return value: (transfer full) (array length=out_len) (element-type guint8):
* newly allocated buffer containing the binary data