3 files changed, 3 insertions, 3 deletions
diff --git a/src/libstd/num/f32.rs b/src/libstd/num/f32.rs
index c6d183c6fb8..94cff78375a 100644
--- a/src/libstd/num/f32.rs
+++ b/src/libstd/num/f32.rs
@@ -364,7 +364,7 @@ impl Round for f32 {
     ///
     /// The fractional part of the number, satisfying:
     ///
-    /// ~~~
+    /// ~~~ {.rust}
     /// assert!(x == trunc(x) + fract(x))
     /// ~~~
     ///
diff --git a/src/libstd/num/f64.rs b/src/libstd/num/f64.rs
index 262e4176c91..b7754ed07ad 100644
--- a/src/libstd/num/f64.rs
+++ b/src/libstd/num/f64.rs
@@ -376,7 +376,7 @@ impl Round for f64 {
     ///
     /// The fractional part of the number, satisfying:
     ///
-    /// ~~~
+    /// ~~~ {.rust}
     /// assert!(x == trunc(x) + fract(x))
     /// ~~~
     ///
diff --git a/src/libstd/num/float.rs b/src/libstd/num/float.rs
index d04f12f6bd3..acc5e5a6f39 100644
--- a/src/libstd/num/float.rs
+++ b/src/libstd/num/float.rs
@@ -454,7 +454,7 @@ impl Round for float {
     ///
     /// The fractional part of the number, satisfying:
     ///
-    /// ~~~
+    /// ~~~ {.rust}
     /// assert!(x == trunc(x) + fract(x))
     /// ~~~
     ///