diff --git a/include/mbedtls/error.h b/include/mbedtls/error.h
index a52f9f5..9696f17 100644
--- a/include/mbedtls/error.h
+++ b/include/mbedtls/error.h
@@ -86,7 +86,7 @@
  * CHACHA20  3                  0x0051-0x0055
  * POLY1305  3                  0x0057-0x005B
  * CHACHAPOLY 2 0x0054-0x0056
- * PLATFORM  3  0x0070-0x0072   0x0071-0x0071
+ * PLATFORM  4  0x0070-0x0072   0x0071-0x0071 0x0076-0x0076
  *
  * High-level module nr (3 bits - 0x0...-0x7...)
  * Name      ID  Nr of Errors
diff --git a/include/mbedtls/nist_kw.h b/include/mbedtls/nist_kw.h
index 3b67b59..c94c15a 100644
--- a/include/mbedtls/nist_kw.h
+++ b/include/mbedtls/nist_kw.h
@@ -133,6 +133,7 @@
  *
  * \return          \c 0 on success.
  * \return          \c MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA for invalid input length.
+ * \return          \c MBEDTLS_ERR_PLATFORM_ALLOC_FAILED in case of a memory allocation failure.
  * \return          cipher-specific error code on failure of the underlying cipher.
  */
 int mbedtls_nist_kw_wrap( mbedtls_nist_kw_context *ctx, mbedtls_nist_kw_mode_t mode,
diff --git a/include/mbedtls/platform.h b/include/mbedtls/platform.h
index ec1df15..8a88ce7 100644
--- a/include/mbedtls/platform.h
+++ b/include/mbedtls/platform.h
@@ -42,6 +42,7 @@
 #define MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED     -0x0070 /**< Hardware accelerator failed */
 #define MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED -0x0072 /**< The requested feature is not supported by the platform */
 #define MBEDTLS_ERR_PLATFORM_FAULT_DETECTED      -0x0071 /**< A hardware fault was detected in a critical path. As a security precaution this should be treated as a potential physical attack */
+#define MBEDTLS_ERR_PLATFORM_ALLOC_FAILED        -0x0076 /**< Memory allocation failed */
 
 #if defined(MBEDTLS_PLATFORM_C)
 
diff --git a/include/mbedtls/platform_util.h b/include/mbedtls/platform_util.h
index d05c3c7..4e0f989 100644
--- a/include/mbedtls/platform_util.h
+++ b/include/mbedtls/platform_util.h
@@ -209,8 +209,8 @@
  * \param src   Source buffer where the data is being moved from.
  * \param num   The length of the buffers in bytes.
  *
- * \return      0 if the operation was successful or -1 if memory allocation
- *              failed.
+ * \return      0 if the operation was successful
+ * \return      #MBEDTLS_ERR_PLATFORM_ALLOC_FAILED if a memory allocation failed
  */
 int mbedtls_platform_memmove( void *dst, const void *src, size_t num );