Fixed typo in base64.h
diff --git a/include/polarssl/base64.h b/include/polarssl/base64.h
index 883215d..fb0d753 100644
--- a/include/polarssl/base64.h
+++ b/include/polarssl/base64.h
@@ -63,8 +63,8 @@
* \param slen amount of data to be decoded
*
* \return 0 if successful, POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL, or
- * POLARSSL_ERR_BASE64_INVALID_DATA if the input data is not
- * correct. *dlen is always updated to reflect the amount
+ * POLARSSL_ERR_BASE64_INVALID_CHARACTER if the input data is
+ * not correct. *dlen is always updated to reflect the amount
* of data that has (or would have) been written.
*
* \note Call this function with *dlen = 0 to obtain the