From 0aea3f8170cbece7fc64e66198622bcdf038d02a Mon Sep 17 00:00:00 2001
From: Jason Curtis <jason@optionzero.co>
Date: Wed, 16 Aug 2023 13:52:49 -0700
Subject: [PATCH] Documentation for #2509

---
 packages/mermaid/src/docs/syntax/flowchart.md | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/packages/mermaid/src/docs/syntax/flowchart.md b/packages/mermaid/src/docs/syntax/flowchart.md
index 56cad19a03e..964ba269b38 100644
--- a/packages/mermaid/src/docs/syntax/flowchart.md
+++ b/packages/mermaid/src/docs/syntax/flowchart.md
@@ -471,6 +471,29 @@ flowchart LR
   B1 --> B2
 ```
 
+#### Limitation
+
+If any of a subgraph's nodes are linked to the outside, subgraph direction will be ignored. The subgraph will inherit the direction of the top-level graph:
+
+```mermaid-example
+flowchart LR
+    subgraph subgraph1
+        direction TB
+        top1[top] --> bottom1[bottom]
+    end
+    subgraph subgraph2
+        direction TB
+        top2[top] --> bottom2[bottom]
+    end
+    %% ^ These subgraphs are identical, except for the links to them:
+    
+    %% Link *to* subgraph1: subgraph1 direction is mantained
+    outside --> subgraph1
+    %% Link *within* subgraph2:
+    %% subgraph2 inherits the direction of the top-level graph (LR)
+    outside ---> top2
+```
+
 ## Markdown Strings
 
 The "Markdown Strings" feature enhances flowcharts and mind maps by offering a more versatile string type, which supports text formatting options such as bold and italics, and automatically wraps text within labels.