diff --git a/CMakeLists.txt b/CMakeLists.txt
index 421b697..de8f3cb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required (VERSION 3.2)
 project(identiconpp
-        VERSION 0.5.0
+        VERSION 0.6.0
         LANGUAGES CXX
 )
 
diff --git a/src/identiconpp.cpp b/src/identiconpp.cpp
index 22c1923..90a6838 100644
--- a/src/identiconpp.cpp
+++ b/src/identiconpp.cpp
@@ -26,7 +26,7 @@ Identiconpp::Identiconpp(const uint8_t columns, const uint8_t rows,
                          algorithm type,
                          const string &background,
                          const vector<string> &foreground,
-                         const array<const uint8_t, 2> &padding)
+                         const array<uint8_t, 2> &padding)
 : _rows(rows)
 , _columns(columns)
 , _type(type)
diff --git a/src/identiconpp.hpp b/src/identiconpp.hpp
index 56277a5..e148671 100644
--- a/src/identiconpp.hpp
+++ b/src/identiconpp.hpp
@@ -73,12 +73,14 @@ public:
      *  @param  background  Background color, hexadecimal, rrggbbaa
      *  @param  foreground  vector of foreground colors
      *  @param  padding     Padding in pixels { left & right, top & down }
+     *  
+     *  @since  before 0.5.0
      */
     explicit Identiconpp(const uint8_t columns, const uint8_t rows,
                          algorithm type = algorithm::ltr_symmetric,
                          const string &background = "ffffffff",
                          const vector<string> &foreground = { "000000ff" },
-                         const array<const uint8_t, 2> &padding = { 0, 0 });
+                         const array<uint8_t, 2> &padding = { 0, 0 });
 
     /*!
      *  @brief  Generates identicon from digest.
@@ -87,6 +89,8 @@ public:
      *  @param  width   The width of the image in pixels
      *
      *  @return The image as Magick::Image
+     *
+     *  @since  before 0.5.0
      */
     Magick::Image generate(const string &digest, const uint16_t width = 100);
 
@@ -98,6 +102,8 @@ public:
      *  @param  width   The width of the image in pixels
      *
      *  @return The image as base64-string
+     *
+     *  @since  0.5.0
      */
     const string generate_base64(const string &magick, const string &digest,
                                  const uint16_t width = 100);
@@ -108,7 +114,7 @@ private:
     const algorithm _type;
     const string _background;
     const vector<string> _foreground;
-    const array<const uint8_t, 2> _padding;
+    const array<uint8_t, 2> _padding;
 
     /*!
      *  @brief  Generate ltr_symmetric identicon.
@@ -120,6 +126,8 @@ private:
      *  @param  digest  The pre-computed digest
      *
      *  @return The image
+     *  
+     *  @since  before 0.5.0
      */
     Magick::Image generate_ltr_symmetric(const string &digest);
 
@@ -133,6 +141,8 @@ private:
      *  @param  digest  The pre-computed digest
      *
      *  @return The image
+     *  
+     *  @since  before 0.5.0
      */
     Magick::Image generate_ltr_asymmetric(const string &digest);
 
@@ -146,6 +156,8 @@ private:
      *  @param  digest  The pre-computed digest
      *
      *  @return The image
+     *  
+     *  @since  before 0.5.0
      */
     Magick::Image generate_sigil(const string &digest);
 
@@ -156,6 +168,8 @@ private:
      *
      *  @param  digest  The pre-computed digest
      *  @param  type    The type of identicon
+     *  
+     *  @since  before 0.5.0
      */
     void check_entropy(const string &digest, algorithm type);
 
@@ -166,6 +180,8 @@ private:
      *  @param  digest  The digest
      *
      *  @return The bit.
+     *  
+     *  @since  before 0.5.0
      */
     bool get_bit(const uint16_t bit, const string &digest);
 
@@ -178,6 +194,8 @@ private:
      *  @param  digest    The digest
      *
      *  @return A foreground color.
+     *  
+     *  @since  before 0.5.0
      */
     Magick::Color get_color(const uint16_t firstbit, const string &digest);
 
@@ -187,6 +205,8 @@ private:
      *  @param  c       Character to check
      *
      *  @return true if not hex.
+     *  
+     *  @since  before 0.5.0
      */
     static bool not_hex(const char c);
 
@@ -194,6 +214,8 @@ private:
      *  @brief  Performs checks on a color definition in a string.
      *
      *  @param  color   The color as string
+     *  
+     *  @since  before 0.5.0
      */
     void check_color(const string &color);
 };
diff --git a/src/identiconpp_c.h b/src/identiconpp_c.h
index 3c1d0cb..74e646a 100644
--- a/src/identiconpp_c.h
+++ b/src/identiconpp_c.h
@@ -61,6 +61,8 @@ extern "C"
      *  @param  padding         Padding in pixels { left & right, top & down }
      *
      *  @return false on error, true otherwise.
+     *  
+     *  @since  before 0.5.0
      */
     bool identiconpp_setup(const uint8_t columns, const uint8_t rows,
                            identiconpp_algorithm type,
@@ -77,6 +79,8 @@ extern "C"
      *  @param  width   The width of the identicon
      *
      *  @return Length of the generated base64-string, or 0 on error.
+     *  
+     *  @since  before 0.5.0
      */
     uint64_t identiconpp_generate(const char magick[],
                                   const char digest[], const uint16_t width);
@@ -84,6 +88,8 @@ extern "C"
     /*!
      *  @brief  Return base64-encoded string of the image generated with
      *          identiconpp_generate().
+     *
+     *  @since  before 0.5.0
      */
     const char *identiconpp_base64();