diff --git a/.cdb-readme.md b/.cdb-readme.md
index 2980e82..5850723 100644
--- a/.cdb-readme.md
+++ b/.cdb-readme.md
@@ -1,5 +1,11 @@
 *Support/Discussion on [Warr1024's Small Projects Discord](https://discord.gg/KMbCjAHBTs)*
 
+## Printability Validation
+
+Suspected printability issues (bad bridges or overhangs, things that would require extra support material) will be automatically detected and highlighted in **crimson**. Minimizing these areas will lead to prints that require less support material and come out with better quality.
+
+Note that the printability validation is "conservative" in some cases and does not allow things that would actually work fine, like bridges made out of wedge shapes, while a full slicer may still be able to find a strategy to print these. This is not necessarily an error.
+
 ## How to Use
 
 - Install the game, along with the recommended mods:
@@ -13,7 +19,7 @@
 - Build things using the provided materials.
 	- You can choose any scale you want for your models (within the
 	  capabilities of the engine and your computer).
-	- Nodes that turn **dark red** are warning you about printability issues
+	- Nodes that turn **crimson** are warning you about printability issues
 	  where your slicer will need to generate extra support (costs more time,
 	  effort, materials to print) or cause other problems elsewhere (sagging
 	  bridges or overhangs) so try to minimize them.