diff --git a/app/vmalert/README.md b/app/vmalert/README.md
index 1d0e785e01..1a98ed83f6 100644
--- a/app/vmalert/README.md
+++ b/app/vmalert/README.md
@@ -82,6 +82,10 @@ name: <string>
 # up round execution speed. 
 [ concurrency: <integer> | default = 1 ]
 
+# Optional type for expressions inside the rules. Supported values: "graphite" and "prometheus".
+# By default "prometheus" rule type is used.
+[ type: <string> ]
+
 rules:
   [ - <rule> ... ]
 ```
@@ -182,7 +186,7 @@ Used as alert source in AlertManager.
 ### Graphite
 
 vmalert sends requests to `<-datasource.url>/render?format=json` during evaluation of alerting and recording rules
-if the corresponding rule contains `type: "graphite"` config option. It is expected that the `<-datasource.url>/render`
+if the corresponding group or rule contains `type: "graphite"` config option. It is expected that the `<-datasource.url>/render`
 implements [Graphite Render API](https://graphite.readthedocs.io/en/stable/render_api.html) for `format=json`.
 
 
diff --git a/docs/vmalert.md b/docs/vmalert.md
index 1d0e785e01..1a98ed83f6 100644
--- a/docs/vmalert.md
+++ b/docs/vmalert.md
@@ -82,6 +82,10 @@ name: <string>
 # up round execution speed. 
 [ concurrency: <integer> | default = 1 ]
 
+# Optional type for expressions inside the rules. Supported values: "graphite" and "prometheus".
+# By default "prometheus" rule type is used.
+[ type: <string> ]
+
 rules:
   [ - <rule> ... ]
 ```
@@ -182,7 +186,7 @@ Used as alert source in AlertManager.
 ### Graphite
 
 vmalert sends requests to `<-datasource.url>/render?format=json` during evaluation of alerting and recording rules
-if the corresponding rule contains `type: "graphite"` config option. It is expected that the `<-datasource.url>/render`
+if the corresponding group or rule contains `type: "graphite"` config option. It is expected that the `<-datasource.url>/render`
 implements [Graphite Render API](https://graphite.readthedocs.io/en/stable/render_api.html) for `format=json`.