diff --git a/README.mux b/README.mux
index 3c9a2d51..a33efb27 100644
--- a/README.mux
+++ b/README.mux
@@ -39,8 +39,10 @@ GET_OPTIONS:
 
 SET_OPTIONS:
  Set color profile/metadata.
-   icc       Set ICC Color profile.
-   xmp       Set XMP metadata.
+   icc  file.icc     Set ICC Color profile.
+   xmp  file.xmp     Set XMP metadata.
+   where:    'file.icc' contains the color profile to be set,
+             'file.xmp' contains the metadata to be set
 
 STRIP_OPTIONS:
  Strip color profile/metadata.
diff --git a/examples/webpmux.c b/examples/webpmux.c
index 32afd229..db5ff103 100644
--- a/examples/webpmux.c
+++ b/examples/webpmux.c
@@ -277,8 +277,10 @@ static void PrintHelp(void) {
   printf("\n");
   printf("SET_OPTIONS:\n");
   printf(" Set color profile/metadata.\n");
-  printf("   icc       Set ICC Color profile.\n");
-  printf("   xmp       Set XMP metadata.\n");
+  printf("   icc  file.icc     Set ICC Color profile.\n");
+  printf("   xmp  file.xmp     Set XMP metadata.\n");
+  printf("   where:    'file.icc' contains the color profile to be set,\n");
+  printf("             'file.xmp' contains the metadata to be set\n");
 
   printf("\n");
   printf("STRIP_OPTIONS:\n");
diff --git a/man/webpmux.1 b/man/webpmux.1
index 310fbb6d..179865c7 100644
--- a/man/webpmux.1
+++ b/man/webpmux.1
@@ -61,11 +61,15 @@ Get nth frame.
 
 .SS SET_OPTIONS (\-set)
 .TP
-.B icc
+.B icc file.icc
 Set ICC Color profile.
+.P
+Where: 'file.icc' contains the color profile to be set.
 .TP
-.B xmp
+.B xmp file.xmp
 Set XMP metadata.
+.P
+Where: 'file.xmp' contains the metadata to be set.
 
 .SS STRIP_OPTIONS (\-strip)
 .TP