diff --git a/mu.md b/mu.md
index ef948790..563ad573 100644
--- a/mu.md
+++ b/mu.md
@@ -197,6 +197,7 @@ var/reg <- increment
 increment var
 var/reg <- decrement
 decrement var
+
 var1/reg1 <- add var2/reg2
 var/reg <- add var2
 add-to var1, var2/reg
diff --git a/tutorial/index.md b/tutorial/index.md
index 621d507a..4188db1e 100644
--- a/tutorial/index.md
+++ b/tutorial/index.md
@@ -192,3 +192,11 @@ command as often as you like:
 ```
 ./translate tutorial/task5.mu  &&  qemu-system-i386 code.img
 ```
+
+The section on [integer primitives](https://github.com/akkartik/mu/blob/main/mu.md#integer-primitives) shows that Mu consistently follows a few rules:
+* Instructions that write to a register always have an output before the `<-`.
+* Instructions that use an argument in memory always have it as the first
+  inout.
+* Instructions that write to memory have a preposition in their name. Contrast
+  `add` to a register vs `add-to` a memory location, `subtract` from a
+  register vs `subtract-from` a memory location, and so on.