diff --git a/README.md b/README.md
index 5d467a9954b97a3daadc44f2c48088c60211eaca..7703707f2dd3214ce9e62f65967c266dfff2b7ef 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,10 @@ While layout changes are generally not a problem, please try to leave the title
 - Use raster images with lossless compression (`png`, ...) for screenshots and other images that were rastered in their original form.
 - Use raster images with lossy compression (`jpeg`, ...) for pictures taken with a camera.
 
+### Symbols and Equations
+- All symbols that appear in equations (or elsewhere) must be properly explained.
+- Symbol usage must be consistent throughout your writeup, e.g. don't use `x(t)` to refer to the baseband and the passband signal.
+
 ### Units and Quantities
 - When writing quantities, use a package like `siunitx` (if possible) - then you don't have to deal with the typography yourself.
 - Prefer quantity equations (equations that remain valid independent of the units, e.g. `\lambda = c / f`) and make sure the units work out. Avoid numerical-value equations (equations that depend on the quantities being expressed in specific units, e.g. `\lambda in m = 300 / f in MHz`). If numerical-value equations are required or very common, give the quantity equation beforehand.