diff --git a/src/http/modules/ngx_http_limit_req_module.c b/src/http/modules/ngx_http_limit_req_module.c
index 146ac3506..faeb45d5c 100644
--- a/src/http/modules/ngx_http_limit_req_module.c
+++ b/src/http/modules/ngx_http_limit_req_module.c
@@ -16,7 +16,7 @@
 #define NGX_HTTP_LIMIT_REQ_DELAYED_DRY_RUN   4
 #define NGX_HTTP_LIMIT_REQ_REJECTED_DRY_RUN  5
 
-#define NGX_HTTP_LIMIT_REQ_RATE_SCALE_MULTIPLIER    1000
+#define NGX_HTTP_LIMIT_REQ_RATE_SCALE_MULTIPLIER    1000000
 
 
 typedef struct {
@@ -25,7 +25,7 @@ typedef struct {
     u_short                      len;
     ngx_queue_t                  queue;
     ngx_msec_t                   last;
-    /* integer value, 1 corresponds to 0.001 r/s */
+    /* integer value, 1 corresponds to 0.000001 r/s */
     ngx_uint_t                   excess;
     ngx_uint_t                   count;
     u_char                       data[1];
@@ -42,7 +42,7 @@ typedef struct {
 typedef struct {
     ngx_http_limit_req_shctx_t  *sh;
     ngx_slab_pool_t             *shpool;
-    /* integer value, 1 corresponds to 0.001 r/s */
+    /* integer value, 1 corresponds to 0.000001 r/s */
     ngx_uint_t                   rate;
     ngx_http_complex_value_t     key;
     ngx_http_limit_req_node_t   *node;
@@ -51,7 +51,7 @@ typedef struct {
 
 typedef struct {
     ngx_shm_zone_t              *shm_zone;
-    /* integer value, 1 corresponds to 0.001 r/s */
+    /* integer value, 1 corresponds to 0.000001 r/s */
     ngx_uint_t                   burst;
     ngx_uint_t                   delay;
 } ngx_http_limit_req_limit_t;
@@ -914,6 +914,12 @@ ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
             } else if (ngx_strncmp(p, "r/m", 3) == 0) {
                 scale = 60;
                 len -= 3;
+            } else if (ngx_strncmp(p, "r/h", 3) == 0) {
+                scale = 3600;
+                len -= 3;
+            } else if (ngx_strncmp(p, "r/d", 3) == 0) {
+                scale = 86400;
+                len -= 3;
             }
 
             rate = ngx_atoi(value[i].data + 5, len - 5);