diff --git a/guide/troubleshooting.md b/guide/troubleshooting.md
index 39e56cd..17a6049 100644
--- a/guide/troubleshooting.md
+++ b/guide/troubleshooting.md
@@ -340,6 +340,9 @@ here are some things to check:
     guide](schema.md) prior to 29 Feb 2020, look at [this
     update](https://github.com/scottlamb/moonfire-nvr/commit/92266612b5c9163eb6096c580ba751280a403648#diff-e8bdd96dda101a25a541a6629675ea46bd6eaf670c6417c76662db5397c50c19)
     to those instructions.
+*   The live view currently only uses the `sub` stream. If you configure only
+    a `main` stream on your cameras, you will see this error consistently.
+    [#119](https://github.com/scottlamb/moonfire-nvr/issues/119)
 
 ### Errors in kernel logs