diff --git a/layers/dot-cams/README.md b/layers/dot-cams/README.md
index c9a586d..09f17ed 100644
--- a/layers/dot-cams/README.md
+++ b/layers/dot-cams/README.md
@@ -137,3 +137,9 @@ https://dot.ca.gov/programs/traffic-operations/traveler-information/511
 
 Some kind of signature needed:
     "fl": "https://fl511.com/",
+
+
+### Known data errors
+- WI sure has a lot of cameras on null island
+- Nebraska has one camera located in California
+- Several workarounds documented in code