diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index 2fb4a3b0a..f2f638a9f 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -24,22 +24,20 @@
 #ifndef SRS_CORE_HPP
 #define SRS_CORE_HPP
 
-// current release version
+// The version config.
 #define VERSION_MAJOR       3
 #define VERSION_MINOR       0
 #define VERSION_REVISION   49
 
-// generated by configure, only macros.
+// The macros generated by configure script.
 #include <srs_auto_headers.hpp>
 
-// provider info.
+// The project informations, may sent to client in HTTP header or RTMP metadata.
 #define RTMP_SIG_SRS_KEY "SRS"
 #define RTMP_SIG_SRS_CODE "OuXuli"
 #define RTMP_SIG_SRS_AUTHROS "winlin,wenjie.zhao"
-// contact info.
 #define RTMP_SIG_SRS_WEB "http://ossrs.net"
 #define RTMP_SIG_SRS_EMAIL "winlin@vip.126.com"
-// debug info.
 #define RTMP_SIG_SRS_ROLE "cluster"
 #define RTMP_SIG_SRS_URL "https://github.com/ossrs/srs"
 #define RTMP_SIG_SRS_LICENSE "The MIT License (MIT)"
@@ -49,33 +47,27 @@
 #define RTMP_SIG_SRS_VERSION SRS_XSTR(VERSION_MAJOR) "." SRS_XSTR(VERSION_MINOR) "." SRS_XSTR(VERSION_REVISION)
 #define RTMP_SIG_SRS_SERVER RTMP_SIG_SRS_KEY "/" RTMP_SIG_SRS_VERSION "(" RTMP_SIG_SRS_CODE ")"
 
-// stable major version
+// The current stable release.
 #define VERSION_STABLE 2
 #define VERSION_STABLE_BRANCH SRS_XSTR(VERSION_STABLE)".0release"
 
-// internal macros, covert macro values to str,
-// see: read https://gcc.gnu.org/onlinedocs/cpp/Stringification.html#Stringification
+// To convert macro values to string.
+// @see https://gcc.gnu.org/onlinedocs/cpp/Stringification.html#Stringification
 #define SRS_XSTR(v) SRS_INTERNAL_STR(v)
 #define SRS_INTERNAL_STR(v) #v
 
-/**
- * the core provides the common defined macros, utilities,
- * user must include the srs_core.hpp before any header, or maybe
- * build failed.
- */
-
-// for 32bit os, 2G big file limit for unistd io, 
+// For 32bit os, 2G big file limit for unistd io,
 // ie. read/write/lseek to use 64bits size for huge file.
 #ifndef _FILE_OFFSET_BITS
     #define _FILE_OFFSET_BITS 64
 #endif
 
-// for int64_t print using PRId64 format.
+// For int64_t print using PRId64 format.
 #ifndef __STDC_FORMAT_MACROS
     #define __STDC_FORMAT_MACROS
 #endif
 
-// for srs-librtmp, @see https://github.com/ossrs/srs/issues/213
+// For srs-librtmp, @see https://github.com/ossrs/srs/issues/213
 #ifndef _WIN32
 #include <inttypes.h>
 #endif
@@ -86,22 +78,21 @@
 #include <stddef.h>
 #include <sys/types.h>
 
-// Time defines.
+// The time unit for timeout, interval or duration.
 #include <srs_core_time.hpp>
 
 // Some important performance options.
 #include <srs_core_performance.hpp>
 
-// free the p and set to NULL.
-// p must be a T*.
+// To free the p and set to NULL.
+// @remark The p must be a pointer T*.
 #define srs_freep(p) \
     if (p) { \
         delete p; \
         p = NULL; \
     } \
     (void)0
-// please use the freepa(T[]) to free an array,
-// or the behavior is undefined.
+// Please use the freepa(T[]) to free an array, otherwise the behavior is undefined.
 #define srs_freepa(pa) \
     if (pa) { \
         delete[] pa; \
@@ -109,11 +100,8 @@
     } \
     (void)0
 
-/**
- * important check for st(state-threads),
- * only support the following cpus: i386/amd64/x86_64/arm
- * @reamrk to patch ST for arm, read https://github.com/ossrs/state-threads/issues/1
- */
+// Checking for st(state-threads), only support the following cpus: i386/amd64/x86_64/arm
+// @reamrk to patch ST for arm, read https://github.com/ossrs/state-threads/issues/1
 #if !defined(__amd64__) && !defined(__x86_64__) && !defined(__i386__) && !defined(__arm__)
     #error "only support i386/amd64/x86_64/arm cpu"
 #endif