diff --git a/README.md b/README.md
index 7a1db62e..8a8c2640 100644
--- a/README.md
+++ b/README.md
@@ -146,14 +146,6 @@ Examples:
   # See https://github.com/databus23/helm-diff/issues/278 for more information.
   HELM_DIFF_IGNORE_UNKNOWN_FLAGS=true helm diff upgrade my-release stable/postgres --wait
 
-  # helm-diff disallows the use of the `lookup` function by default.
-  # To enable it, you must set HELM_DIFF_USE_INSECURE_SERVER_SIDE_DRY_RUN=true to
-  # use `helm template --dry-run=server` or
-  # `helm upgrade --dry-run=server` (in case you also set `HELM_DIFF_USE_UPGRADE_DRY_RUN`)
-  # See https://github.com/databus23/helm-diff/pull/458
-  # for more information.
-  HELM_DIFF_USE_INSECURE_SERVER_SIDE_DRY_RUN=true helm diff upgrade my-release datadog/datadog
-
   # Set HELM_DIFF_USE_UPGRADE_DRY_RUN=true to
   # use `helm upgrade --dry-run` instead of `helm template` to render manifests from the chart.
   # See https://github.com/databus23/helm-diff/issues/253 for more information.
diff --git a/cmd/upgrade.go b/cmd/upgrade.go
index 74533679..1e7b153a 100644
--- a/cmd/upgrade.go
+++ b/cmd/upgrade.go
@@ -129,14 +129,6 @@ func newChartCommand() *cobra.Command {
 			"  # See https://github.com/databus23/helm-diff/issues/278 for more information.",
 			"  HELM_DIFF_IGNORE_UNKNOWN_FLAGS=true helm diff upgrade my-release stable/postgres --wait",
 			"",
-			"  # helm-diff disallows the use of the `lookup` function by default.",
-			"  # To enable it, you must set HELM_DIFF_USE_INSECURE_SERVER_SIDE_DRY_RUN=true to",
-			"  # use `helm template --dry-run=server` or",
-			"  # `helm upgrade --dry-run=server` (in case you also set `HELM_DIFF_USE_UPGRADE_DRY_RUN`)",
-			"  # See https://github.com/databus23/helm-diff/pull/458",
-			"  # for more information.",
-			"  HELM_DIFF_USE_INSECURE_SERVER_SIDE_DRY_RUN=true helm diff upgrade my-release datadog/datadog",
-			"",
 			"  # Set HELM_DIFF_USE_UPGRADE_DRY_RUN=true to",
 			"  # use `helm upgrade --dry-run` instead of `helm template` to render manifests from the chart.",
 			"  # See https://github.com/databus23/helm-diff/issues/253 for more information.",