diff --git a/inc/thorvg.h b/inc/thorvg.h
index 6c721f8d..14f97816 100644
--- a/inc/thorvg.h
+++ b/inc/thorvg.h
@@ -1274,12 +1274,19 @@ public:
     /**
      * @brief Loads a raw data from a memory block with a given size.
      *
+     * @param[in] paint A Tvg_Paint pointer to the picture object.
+     * @param[in] data A pointer to a memory location where the content of the picture raw data is stored.
+     * @param[in] w The width of the image @p data in pixels.
+     * @param[in] h The height of the image @p data in pixels.
+     * @param[in] premultiplied If @c true, the given image data is alpha-premultiplied.
+     * @param[in] copy If @c true the data are copied into the engine local buffer, otherwise they are not.
+     *
      * @retval Result::Success When succeed, Result::InsufficientCondition otherwise.
      * @retval Result::FailedAllocation An internal error possibly with memory allocation.
      *
      * @since 0.9
      */
-    Result load(uint32_t* data, uint32_t w, uint32_t h, bool premultiplied, bool copy) noexcept;
+    Result load(uint32_t* data, uint32_t w, uint32_t h, bool premultiplied, bool copy = false) noexcept;
 
     /**
      * @brief Sets or removes the triangle mesh to deform the image.
diff --git a/src/bindings/capi/thorvg_capi.h b/src/bindings/capi/thorvg_capi.h
index a19c68c7..079bcb3a 100644
--- a/src/bindings/capi/thorvg_capi.h
+++ b/src/bindings/capi/thorvg_capi.h
@@ -1968,6 +1968,13 @@ TVG_API Tvg_Result tvg_picture_load(Tvg_Paint* paint, const char* path);
 /*!
 * \brief Loads a picture data from a memory block of a given size.
 *
+* \param[in] paint A Tvg_Paint pointer to the picture object.
+* \param[in] data A pointer to a memory location where the content of the picture raw data is stored.
+* \param[in] w The width of the image @p data in pixels.
+* \param[in] h The height of the image @p data in pixels.
+* \param[in] premultiplied If @c true, the given image data is alpha-premultiplied.
+* \param[in] copy If @c true the data are copied into the engine local buffer, otherwise they are not.
+*
 * \return Tvg_Result enumeration.
 * \retval TVG_RESULT_SUCCESS Succeed.
 * \retval TVG_RESULT_INVALID_ARGUMENT An invalid Tvg_Paint pointer or no data are provided or the @p width or @p height value is zero or less.