diff --git a/brownian-motion.md b/brownian-motion.md
new file mode 100644
index 000000000..fd53d8ec2
--- /dev/null
+++ b/brownian-motion.md
@@ -0,0 +1,8 @@
+# brownian motion
+
+- [[go]] en.wikipedia.org/wiki/Brownian_motion
+
+
+[//begin]: # "Autogenerated link references for markdown compatibility"
+[go]: go "Go"
+[//end]: # "Autogenerated link references"
\ No newline at end of file
diff --git a/noise-colors.md b/noise-colors.md
index 22ff41203..d47f3e84f 100644
--- a/noise-colors.md
+++ b/noise-colors.md
@@ -2,8 +2,11 @@
 
 - a [[list]]
   - [[white noise]]
+    - uniform frequency
   - [[gray noise]]
+    - the above but adjusted to our psychoacoustic model so it *sounds* uniform
   - [[brown noise]]
+    - generated with a model that approximates [[brownian motion]]
   - [[pink noise]]
   - [[pull]] [[colors of noise]]
 - What's your [[favorite color]]?