diff --git a/src/libstd/f32.rs b/src/libstd/f32.rs
index 267d7013b1e42..171891b5dabc0 100644
--- a/src/libstd/f32.rs
+++ b/src/libstd/f32.rs
@@ -355,7 +355,7 @@ impl f32 {
         return unsafe { intrinsics::powf32(self, n) };
     }
 
-    /// Takes the square root of a number.
+    /// Returns the square root of a number.
     ///
     /// Returns NaN if `self` is a negative number.
     ///
@@ -564,7 +564,7 @@ impl f32 {
         unsafe { cmath::fdimf(self, other) }
     }
 
-    /// Takes the cubic root of a number.
+    /// Returns the cubic root of a number.
     ///
     /// # Examples
     ///
diff --git a/src/libstd/f64.rs b/src/libstd/f64.rs
index 61ce7b29e26fc..2dbd942f3324d 100644
--- a/src/libstd/f64.rs
+++ b/src/libstd/f64.rs
@@ -323,7 +323,7 @@ impl f64 {
         unsafe { intrinsics::powf64(self, n) }
     }
 
-    /// Takes the square root of a number.
+    /// Returns the square root of a number.
     ///
     /// Returns NaN if `self` is a negative number.
     ///
@@ -506,7 +506,7 @@ impl f64 {
         unsafe { cmath::fdim(self, other) }
     }
 
-    /// Takes the cubic root of a number.
+    /// Returns the cubic root of a number.
     ///
     /// # Examples
     ///