diff --git a/src/challenge/c3.rs b/src/challenge/c3.rs
index c189c7d..55ae1f9 100644
--- a/src/challenge/c3.rs
+++ b/src/challenge/c3.rs
@@ -100,9 +100,9 @@ impl C3 {
     ///
     /// Questions will always have the same structure:
     ///
-    /// * "What is x  y?"
+    /// * "What is x + y?" (where the operation can be any of [Operation].)
     ///
-    /// $x$ and $y$ will always be a random integer between 0 and 2^16-1.
+    /// `x` and `y` will always be a random integer between 0 and 2^16-1.
     ///
     /// # Returns
     ///