diff --git a/cmd/traffic_via/traffic_via.cc b/cmd/traffic_via/traffic_via.cc
index 82b9ad3c34e..c816f5a2d20 100644
--- a/cmd/traffic_via/traffic_via.cc
+++ b/cmd/traffic_via/traffic_via.cc
@@ -176,6 +176,7 @@ standardViaLookup(char flag)
     viaTable->viaData[(unsigned char)'N'] = "no error";
     viaTable->viaData[(unsigned char)'F'] = "request forbidden";
     viaTable->viaData[(unsigned char)'R'] = "cache read error";
+    viaTable->viaData[(unsigned char)'M'] = "moved temporarily";
     viaTable->viaData[(unsigned char)' '] = "unknown";
     break;
   default:
diff --git a/doc/appendices/faq.en.rst b/doc/appendices/faq.en.rst
index d8646c56b3d..4951403d5e4 100644
--- a/doc/appendices/faq.en.rst
+++ b/doc/appendices/faq.en.rst
@@ -229,6 +229,7 @@ F     request forbidden
 H     header syntax unacceptable
 N     no error
 R     cache read error
+M     moved temporarily
 S     server related error
 T     connection timed out
 ===== ==========================
diff --git a/proxy/http/HttpTransact.cc b/proxy/http/HttpTransact.cc
index 867ad2a8b3c..aa3f143a4f0 100644
--- a/proxy/http/HttpTransact.cc
+++ b/proxy/http/HttpTransact.cc
@@ -8135,7 +8135,7 @@ HttpTransact::build_error_response(State *s, HTTPStatus status_code, const char
     SET_VIA_STRING(VIA_ERROR_TYPE, VIA_ERROR_DNS_FAILURE);
     break;
   case HTTP_STATUS_MOVED_TEMPORARILY:
-    SET_VIA_STRING(VIA_ERROR_TYPE, VIA_ERROR_SERVER);
+    SET_VIA_STRING(VIA_ERROR_TYPE, VIA_ERROR_MOVED_TEMPORARILY);
     break;
   case HTTP_STATUS_PROXY_AUTHENTICATION_REQUIRED:
     SET_VIA_STRING(VIA_CLIENT_REQUEST, VIA_CLIENT_ERROR);
diff --git a/proxy/http/HttpTransact.h b/proxy/http/HttpTransact.h
index 517322903f0..ad9aceac65d 100644
--- a/proxy/http/HttpTransact.h
+++ b/proxy/http/HttpTransact.h
@@ -183,6 +183,7 @@ enum ViaString_t {
   VIA_ERROR_SERVER = 'S',
   VIA_ERROR_TIMEOUT = 'T',
   VIA_ERROR_CACHE_READ = 'R',
+  VIA_ERROR_MOVED_TEMPORARILY = 'M',
   //
   // Now the detailed stuff
   //
diff --git a/proxy/http/README.via b/proxy/http/README.via
index c5c954fc322..04c4a81e5d0 100644
--- a/proxy/http/README.via
+++ b/proxy/http/README.via
@@ -12,6 +12,7 @@
          A    in cache, not acceptable
          S    in cache, stale
          H    in cache, fresh
+         R    in cache, fresh RAM hit
      
       server stuff
          E    error in response
@@ -35,6 +36,8 @@
          D    dns failure
          F    request forbidden
          H    header syntax unacceptable
+         M    moved temporarily
+         R    cache read error
          S    server related error
          T    connection timed out