diff --git a/docs/syntax/sequenceDiagram.md b/docs/syntax/sequenceDiagram.md
index af234f6088..181693938d 100644
--- a/docs/syntax/sequenceDiagram.md
+++ b/docs/syntax/sequenceDiagram.md
@@ -583,6 +583,12 @@ sequenceDiagram
 
 It is possible to highlight flows by providing colored background rects. This is done by the notation
 
+```
+rect COLOR
+... content ...
+end
+```
+
 The colors are defined using rgb and rgba syntax.
 
 ```
diff --git a/packages/mermaid/src/docs/syntax/sequenceDiagram.md b/packages/mermaid/src/docs/syntax/sequenceDiagram.md
index 77db895142..16ce8d7e26 100644
--- a/packages/mermaid/src/docs/syntax/sequenceDiagram.md
+++ b/packages/mermaid/src/docs/syntax/sequenceDiagram.md
@@ -397,6 +397,12 @@ sequenceDiagram
 
 It is possible to highlight flows by providing colored background rects. This is done by the notation
 
+```
+rect COLOR
+... content ...
+end
+```
+
 The colors are defined using rgb and rgba syntax.
 
 ```