diff --git a/changes/fast_bw_param b/changes/fast_bw_param
new file mode 100644
index 0000000000..abe630d8bc
--- /dev/null
+++ b/changes/fast_bw_param
@@ -0,0 +1,8 @@
+  o Minor features (directory authority):
+    - Provide two consensus parameters (FastFlagMinThreshold and
+      FastFlagMaxThreshold) to control the range of allowable bandwidths for
+      the Fast directory flag. This allows authorities to run better
+      experiments on appropriate requirements for being a "Fast" node.
+      The AuthDirFastGuarantee flag still applies.
+
+
diff --git a/src/or/control.c b/src/or/control.c
index a93994606d..60c62b15a5 100644
--- a/src/or/control.c
+++ b/src/or/control.c
@@ -3482,7 +3482,6 @@ control_event_circuit_cannibalized(origin_circuit_t *circ,
                                             old_tv_created);
 }
 
-
 /** Given an AP connection <b>conn</b> and a <b>len</b>-character buffer
  * <b>buf</b>, determine the address:port combination requested on
  * <b>conn</b>, and write it to <b>buf</b>.  Return 0 on success, -1 on
diff --git a/src/or/dirserv.c b/src/or/dirserv.c
index 94a415fe21..e5995697dd 100644
--- a/src/or/dirserv.c
+++ b/src/or/dirserv.c
@@ -1938,6 +1938,18 @@ dirserv_compute_performance_thresholds(routerlist_t *rl)
   if (guard_tk > TIME_KNOWN_TO_GUARANTEE_FAMILIAR)
     guard_tk = TIME_KNOWN_TO_GUARANTEE_FAMILIAR;
 
+  {
+    /* We can vote on a parameter for the minimum and maximum. */
+    int32_t min_fast, max_fast;
+    min_fast = networkstatus_get_param(NULL, "FastFlagMinThreshold",
+                                       0, 0, INT32_MAX);
+    max_fast = networkstatus_get_param(NULL, "FastFlagMaxThreshold",
+                                       INT32_MAX, min_fast, INT32_MAX);
+    if (fast_bandwidth < (uint32_t)min_fast)
+      fast_bandwidth = min_fast;
+    if (fast_bandwidth > (uint32_t)max_fast)
+      fast_bandwidth = max_fast;
+  }
   /* Protect sufficiently fast nodes from being pushed out of the set
    * of Fast nodes. */
   if (options->AuthDirFastGuarantee &&