diff --git a/README.md b/README.md
index cbe563aad0..b4e658b660 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,10 @@ Quick test:
 
     zig build
 
+If it complains about formatting, here is a mutable command that will fix it:
+
+    zig build fmt
+
 # Debugging tips
 
 Test runs infinitely? Build the test program executable: