diff --git a/docs/user-guide/nginx-configuration/annotations.md b/docs/user-guide/nginx-configuration/annotations.md
index e534575f8..2c4f07b9f 100644
--- a/docs/user-guide/nginx-configuration/annotations.md
+++ b/docs/user-guide/nginx-configuration/annotations.md
@@ -79,6 +79,7 @@ You can add these Kubernetes annotations to specific Ingress objects to customiz
 |[nginx.ingress.kubernetes.io/upstream-vhost](#custom-nginx-upstream-vhost)|string|
 |[nginx.ingress.kubernetes.io/whitelist-source-range](#whitelist-source-range)|CIDR|
 |[nginx.ingress.kubernetes.io/proxy-buffering](#proxy-buffering)|string|
+|[nginx.ingress.kubernetes.io/proxy-buffer-number](#proxy-buffer-number)|number|
 |[nginx.ingress.kubernetes.io/proxy-buffer-size](#proxy-buffer-size)|string|
 |[nginx.ingress.kubernetes.io/ssl-ciphers](#ssl-ciphers)|string|
 |[nginx.ingress.kubernetes.io/connection-proxy-header](#connection-proxy-header)|string|
@@ -546,6 +547,16 @@ To use custom values in an Ingress rule define these annotation:
 nginx.ingress.kubernetes.io/proxy-buffering: "on"
 ```
 
+### Proxy buffer Number
+
+Sets the number of the buffer in [`proxy_buffers`](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffers) used for reading the first part of the response received from the proxied server.
+By default proxy buffer number is set as 4
+
+To configure this setting globally, set `proxy-buffer-number` in [NGINX ConfigMap](./configmap.md#proxy-buffer-number). To use custom values in an Ingress rule, define this annotation:
+```yaml
+nginx.ingress.kubernetes.io/proxy-buffer-number: "4"
+```
+
 ### Proxy buffer size
 
 Sets the size of the buffer [`proxy_buffer_size`](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffer_size) used for reading the first part of the response received from the proxied server.
diff --git a/docs/user-guide/nginx-configuration/configmap.md b/docs/user-guide/nginx-configuration/configmap.md
index 10579c924..eba5f22ff 100644
--- a/docs/user-guide/nginx-configuration/configmap.md
+++ b/docs/user-guide/nginx-configuration/configmap.md
@@ -132,6 +132,7 @@ The following table shows a configuration option's name, type, and the default v
 |[proxy-connect-timeout](#proxy-connect-timeout)|int|5|
 |[proxy-read-timeout](#proxy-read-timeout)|int|60|
 |[proxy-send-timeout](#proxy-send-timeout)|int|60|
+|[proxy-buffer-number](#proxy-buffer-number)|int|4|
 |[proxy-buffer-size](#proxy-buffer-size)|string|"4k"|
 |[proxy-cookie-path](#proxy-cookie-path)|string|"off"|
 |[proxy-cookie-domain](#proxy-cookie-domain)|string|"off"|
@@ -762,6 +763,10 @@ Sets the timeout in seconds for [reading a response from the proxied server](htt
 
 Sets the timeout in seconds for [transmitting a request to the proxied server](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_send_timeout). The timeout is set only between two successive write operations, not for the transmission of the whole request.
 
+## proxy-buffer-number
+
+Sets the number of the buffer used for [reading the first part of the response](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffers) received from the proxied server. This part usually contains a small response header.
+
 ## proxy-buffer-size
 
 Sets the size of the buffer used for [reading the first part of the response](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffer_size) received from the proxied server. This part usually contains a small response header.