diff --git a/zephyr/static/js/blueslip.js b/zephyr/static/js/blueslip.js
index 15a3b222b6..0a67602264 100644
--- a/zephyr/static/js/blueslip.js
+++ b/zephyr/static/js/blueslip.js
@@ -37,8 +37,10 @@ function report_error(msg, stack, opts) {
         type:     'POST',
         url:      '/json/report_error',
         dataType: 'json',
-        data:     { message: msg, stacktrace: stack,
+        data:     { message: msg,
+                    stacktrace: stack,
                     ui_message: opts.show_ui_msg,
+                    more_info: JSON.stringify(opts.more_info),
                     user_agent: window.navigator.userAgent},
         timeout:  3*1000,
         success:  function () {
@@ -78,8 +80,12 @@ function report_error(msg, stack, opts) {
     });
 }
 
-function BlueslipError() {
-    return Error.apply(this, arguments);
+function BlueslipError(msg, more_info) {
+    var self = Error.call(this, msg);
+    if (more_info !== undefined) {
+        self.more_info = more_info;
+    }
+    return self;
 }
 
 BlueslipError.prototype = Error.prototype;
@@ -233,36 +239,49 @@ exports.wrap_function = function blueslip_wrap_function(func) {
     }
 }());
 
-exports.log = function blueslip_log (msg) {
+exports.log = function blueslip_log (msg, more_info) {
     console.log(msg);
+    if (more_info !== undefined) {
+        console.log("Additional information: ", more_info);
+    }
 };
 
-exports.info = function blueslip_info (msg) {
+exports.info = function blueslip_info (msg, more_info) {
     console.info(msg);
+    if (more_info !== undefined) {
+        console.info("Additional information: ", more_info);
+    }
 };
 
-exports.warn = function blueslip_warn (msg) {
+exports.warn = function blueslip_warn (msg, more_info) {
     console.warn(msg);
     if (page_params.debug_mode) {
         console.trace();
     }
+    if (more_info !== undefined) {
+        console.warn("Additional information: ", more_info);
+    }
 };
 
-exports.error = function blueslip_error (msg) {
+exports.error = function blueslip_error (msg, more_info) {
     if (page_params.debug_mode) {
-        throw new BlueslipError(msg);
+        throw new BlueslipError(msg, more_info);
     } else {
         console.error(msg);
-        report_error(msg, Error().stack);
+        if (more_info !== undefined) {
+            console.error("Additional information: ", more_info);
+        }
+        report_error(msg, Error().stack, {more_info: more_info});
     }
 };
 
-exports.fatal = function blueslip_fatal (msg) {
+exports.fatal = function blueslip_fatal (msg, more_info) {
     if (! page_params.debug_mode) {
-        report_error(msg, Error().stack, {show_ui_msg: true});
+        report_error(msg, Error().stack, {show_ui_msg: true,
+                                          more_info: more_info});
     }
 
-    throw new BlueslipError(msg);
+    throw new BlueslipError(msg, more_info);
 };
 
 return exports;
diff --git a/zephyr/views.py b/zephyr/views.py
index 75a156c2f6..7da86c6325 100644
--- a/zephyr/views.py
+++ b/zephyr/views.py
@@ -1527,7 +1527,8 @@ if not (settings.DEBUG or settings.TEST_SUITE):
 @authenticated_json_post_view
 @has_request_variables
 def json_report_error(request, user_profile, message=POST, stacktrace=POST,
-                      ui_message=POST(converter=json_to_bool), user_agent=POST):
+                      ui_message=POST(converter=json_to_bool), user_agent=POST,
+                      more_info=POST(converter=json_to_dict, default=None)):
     subject = "error for %s" % (user_profile.email,)
     if ui_message:
         subject = "User-visible browser " + subject
@@ -1537,10 +1538,16 @@ def json_report_error(request, user_profile, message=POST, stacktrace=POST,
     if js_source_map:
         stacktrace = js_source_map.annotate_stacktrace(stacktrace)
 
-    mail_admins(subject,
-                "Message:\n%s\n\nStacktrace:\n%s\n\nUser agent:\n%s\n\n"
-                "User saw error in UI: %s"
-                % (message, stacktrace, user_agent, ui_message))
+    body = ("Message:\n%s\n\nStacktrace:\n%s\n\nUser agent:\n%s\n\n"
+            "User saw error in UI: %s"
+            % (message, stacktrace, user_agent, ui_message))
+
+    if more_info is not None:
+        body += "\n\nAdditional information:"
+        for (key, value) in more_info.iteritems():
+            body += "\n  %s: %s" % (key, value)
+
+    mail_admins(subject, body)
     return json_success()
 
 @authenticated_json_post_view