diff --git a/README.md b/README.md
index c3a9ca0ca..a0151a91d 100644
--- a/README.md
+++ b/README.md
@@ -274,6 +274,8 @@ VictoriaMetrics accepts data from [DataDog agent](https://docs.datadoghq.com/age
 
 Run DataDog agent with `DD_DD_URL=http://victoriametrics-host:8428/datadog` environment variable in order to write data to VictoriaMetrics at `victoriametrics-host` host. Another option is to set `dd_url` param at [DataDog agent configuration file](https://docs.datadoghq.com/agent/guide/agent-configuration-files/) to `http://victoriametrics-host:8428/datadog`.
 
+VictoriaMetrics doesn't check `DD_API_KEY` param, so it can be set to arbitrary value.
+
 Example on how to send data to VictoriaMetrics via DataDog "submit metrics" API from command line:
 
 ```bash
diff --git a/docs/README.md b/docs/README.md
index c3a9ca0ca..a0151a91d 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -274,6 +274,8 @@ VictoriaMetrics accepts data from [DataDog agent](https://docs.datadoghq.com/age
 
 Run DataDog agent with `DD_DD_URL=http://victoriametrics-host:8428/datadog` environment variable in order to write data to VictoriaMetrics at `victoriametrics-host` host. Another option is to set `dd_url` param at [DataDog agent configuration file](https://docs.datadoghq.com/agent/guide/agent-configuration-files/) to `http://victoriametrics-host:8428/datadog`.
 
+VictoriaMetrics doesn't check `DD_API_KEY` param, so it can be set to arbitrary value.
+
 Example on how to send data to VictoriaMetrics via DataDog "submit metrics" API from command line:
 
 ```bash
diff --git a/docs/Single-server-VictoriaMetrics.md b/docs/Single-server-VictoriaMetrics.md
index f2056ed13..edfcb6a1d 100644
--- a/docs/Single-server-VictoriaMetrics.md
+++ b/docs/Single-server-VictoriaMetrics.md
@@ -278,6 +278,8 @@ VictoriaMetrics accepts data from [DataDog agent](https://docs.datadoghq.com/age
 
 Run DataDog agent with `DD_DD_URL=http://victoriametrics-host:8428/datadog` environment variable in order to write data to VictoriaMetrics at `victoriametrics-host` host. Another option is to set `dd_url` param at [DataDog agent configuration file](https://docs.datadoghq.com/agent/guide/agent-configuration-files/) to `http://victoriametrics-host:8428/datadog`.
 
+VictoriaMetrics doesn't check `DD_API_KEY` param, so it can be set to arbitrary value.
+
 Example on how to send data to VictoriaMetrics via DataDog "submit metrics" API from command line:
 
 ```bash