diff --git a/README.mux b/README.mux
index 8bcdea66..661b12ba 100644
--- a/README.mux
+++ b/README.mux
@@ -31,6 +31,7 @@ Usage: webpmux -get GET_OPTIONS INPUT -o OUTPUT
                [-bgcolor BACKGROUND_COLOR] -o OUTPUT
        webpmux -info INPUT
        webpmux [-h|-help]
+       webpmux -version
 
 GET_OPTIONS:
  Extract relevant data.
diff --git a/examples/gif2webp.c b/examples/gif2webp.c
index 5b43c03e..cb051058 100644
--- a/examples/gif2webp.c
+++ b/examples/gif2webp.c
@@ -233,9 +233,12 @@ int main(int argc, const char *argv[]) {
     } else if (!strcmp(argv[c], "-f") && c < argc - 1) {
       config.filter_strength = strtol(argv[++c], NULL, 0);
     } else if (!strcmp(argv[c], "-version")) {
-      const int version = WebPGetEncoderVersion();
-      printf("%d.%d.%d\n",
-        (version >> 16) & 0xff, (version >> 8) & 0xff, version & 0xff);
+      const int enc_version = WebPGetEncoderVersion();
+      const int mux_version = WebPGetMuxVersion();
+      printf("WebP Encoder version: %d.%d.%d\nWebP Mux version: %d.%d.%d\n",
+             (enc_version >> 16) & 0xff, (enc_version >> 8) & 0xff,
+             enc_version & 0xff, (mux_version >> 16) & 0xff,
+             (mux_version >> 8) & 0xff, mux_version & 0xff);
       return 0;
     } else if (!strcmp(argv[c], "-quiet")) {
       quiet = 1;
diff --git a/examples/vwebp.c b/examples/vwebp.c
index ce5559f8..8ea105bb 100644
--- a/examples/vwebp.c
+++ b/examples/vwebp.c
@@ -278,9 +278,12 @@ int main(int argc, char *argv[]) {
     } else if (!strcmp(argv[c], "-info")) {
       kParams.print_info = 1;
     } else if (!strcmp(argv[c], "-version")) {
-      const int version = WebPGetDecoderVersion();
-      printf("%d.%d.%d\n",
-        (version >> 16) & 0xff, (version >> 8) & 0xff, version & 0xff);
+      const int dec_version = WebPGetDecoderVersion();
+      const int dmux_version = WebPGetDemuxVersion();
+      printf("WebP Decoder version: %d.%d.%d\nWebP Demux version: %d.%d.%d\n",
+             (dec_version >> 16) & 0xff, (dec_version >> 8) & 0xff,
+             dec_version & 0xff, (dmux_version >> 16) & 0xff,
+             (dmux_version >> 8) & 0xff, dmux_version & 0xff);
       return 0;
     } else if (!strcmp(argv[c], "-mt")) {
       config.options.use_threads = 1;
diff --git a/examples/webpmux.c b/examples/webpmux.c
index a4ce6b13..69603fea 100644
--- a/examples/webpmux.c
+++ b/examples/webpmux.c
@@ -49,6 +49,7 @@
   Misc:
     webpmux -info in.webp
     webpmux [ -h | -help ]
+    webpmux -version
 */
 
 #include <assert.h>
@@ -277,6 +278,7 @@ static void PrintHelp(void) {
   printf("               [-bgcolor BACKGROUND_COLOR] -o OUTPUT\n");
   printf("       webpmux -info INPUT\n");
   printf("       webpmux [-h|-help]\n");
+  printf("       webpmux -version\n");
 
   printf("\n");
   printf("GET_OPTIONS:\n");
@@ -628,6 +630,12 @@ static int ParseCommandLine(int argc, const char* argv[],
         PrintHelp();
         DeleteConfig(config);
         exit(0);
+      } else if (!strcmp(argv[i], "-version")) {
+        const int version = WebPGetMuxVersion();
+        printf("%d.%d.%d\n",
+               (version >> 16) & 0xff, (version >> 8) & 0xff, version & 0xff);
+        DeleteConfig(config);
+        exit(0);
       } else {
         ERROR_GOTO2("ERROR: Unknown option: '%s'.\n", argv[i], ErrParse);
       }
diff --git a/man/webpmux.1 b/man/webpmux.1
index 0560138e..d2c2d1b6 100644
--- a/man/webpmux.1
+++ b/man/webpmux.1
@@ -1,5 +1,5 @@
 .\"                                      Hey, EMACS: -*- nroff -*-
-.TH WEBPMUX 1 "February 01, 2013"
+.TH WEBPMUX 1 "February 26, 2013"
 .SH NAME
 webpmux \- command line tool to create WebP Mux/container file.
 .SH SYNOPSIS
@@ -43,6 +43,8 @@ webpmux \- command line tool to create WebP Mux/container file.
 .I INPUT
 .br
 .B webpmux [\-h|\-help]
+.br
+.B webpmux \-version
 .SH DESCRIPTION
 This manual page documents the
 .B webpmux
diff --git a/src/demux/demux.c b/src/demux/demux.c
index 18abcdee..950863a8 100644
--- a/src/demux/demux.c
+++ b/src/demux/demux.c
@@ -21,6 +21,10 @@
 extern "C" {
 #endif
 
+#define DMUX_MAJ_VERSION 0
+#define DMUX_MIN_VERSION 1
+#define DMUX_REV_VERSION 0
+
 typedef struct {
   size_t start_;        // start location of the data
   size_t end_;          // end location
@@ -88,6 +92,12 @@ static const ChunkParser kMasterChunks[] = {
   { { '0', '0', '0', '0' }, NULL,             NULL },
 };
 
+//------------------------------------------------------------------------------
+
+int WebPGetDemuxVersion(void) {
+  return (DMUX_MAJ_VERSION << 16) | (DMUX_MIN_VERSION << 8) | DMUX_REV_VERSION;
+}
+
 // -----------------------------------------------------------------------------
 // MemBuffer
 
diff --git a/src/mux/muxi.h b/src/mux/muxi.h
index 074fb6b4..56f3e027 100644
--- a/src/mux/muxi.h
+++ b/src/mux/muxi.h
@@ -24,6 +24,10 @@ extern "C" {
 //------------------------------------------------------------------------------
 // Defines and constants.
 
+#define MUX_MAJ_VERSION 0
+#define MUX_MIN_VERSION 1
+#define MUX_REV_VERSION 0
+
 // Chunk object.
 typedef struct WebPChunk WebPChunk;
 struct WebPChunk {
diff --git a/src/mux/muxinternal.c b/src/mux/muxinternal.c
index be20dbd5..d137215a 100644
--- a/src/mux/muxinternal.c
+++ b/src/mux/muxinternal.c
@@ -36,6 +36,12 @@ const ChunkInfo kChunks[] = {
   { NIL_TAG,                       WEBP_CHUNK_NIL,     UNDEFINED_CHUNK_SIZE }
 };
 
+//------------------------------------------------------------------------------
+
+int WebPGetMuxVersion(void) {
+  return (MUX_MAJ_VERSION << 16) | (MUX_MIN_VERSION << 8) | MUX_REV_VERSION;
+}
+
 //------------------------------------------------------------------------------
 // Life of a chunk object.
 
diff --git a/src/webp/demux.h b/src/webp/demux.h
index 584402d3..9cc34116 100644
--- a/src/webp/demux.h
+++ b/src/webp/demux.h
@@ -62,6 +62,12 @@ typedef enum WebPFormatFeature WebPFormatFeature;
 typedef struct WebPIterator WebPIterator;
 typedef struct WebPChunkIterator WebPChunkIterator;
 
+//------------------------------------------------------------------------------
+
+// Returns the version number of the demux library, packed in hexadecimal using
+// 8bits for each of major/minor/revision. E.g: v2.5.7 is 0x020507.
+WEBP_EXTERN(int) WebPGetDemuxVersion(void);
+
 //------------------------------------------------------------------------------
 // Life of a Demux object
 
diff --git a/src/webp/mux.h b/src/webp/mux.h
index ab963e92..713d738c 100644
--- a/src/webp/mux.h
+++ b/src/webp/mux.h
@@ -87,6 +87,12 @@ enum WebPChunkId {
   WEBP_CHUNK_NIL
 };
 
+//------------------------------------------------------------------------------
+
+// Returns the version number of the mux library, packed in hexadecimal using
+// 8bits or each of major/minor/revision. E.g: v2.5.7 is 0x020507.
+WEBP_EXTERN(int) WebPGetMuxVersion(void);
+
 //------------------------------------------------------------------------------
 // Life of a Mux object