diff --git a/guide/english/clojure/looprecur/index.md b/guide/english/clojure/looprecur/index.md
index f2d3e5248f..acad009b41 100644
--- a/guide/english/clojure/looprecur/index.md
+++ b/guide/english/clojure/looprecur/index.md
@@ -66,9 +66,9 @@ You might be wondering why you would use `loop/recur` rather than simply definin
 
 This is more concise, and works in a similar way. Why would you _ever_ use loop and recur?
 
-### Tail Call Optimisation
+### Tail Call Optimization
 
-If you use `loop/recur`, then the compiler (the software that turns Clojure code into JVM bytecode) knows that you want to create a recursive loop. This means that it tries its hardest to optimise your code for recursion. Let's compare the speed of `fact` and `fact-no-loop`:
+If you use `loop/recur`, then the compiler (the software that turns Clojure code into JVM bytecode) knows that you want to create a recursive loop. This means that it tries its hardest to optimize your code for recursion. Let's compare the speed of `fact` and `fact-no-loop`:
 
     (time (fact 20))
     ; => "Elapsed time: 0.083927 msecs"
@@ -79,11 +79,11 @@ If you use `loop/recur`, then the compiler (the software that turns Clojure code
 
 ![:rocket:](//forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=2 ":rocket:") <a href='https://ideone.com/tpC0Xo' target='_blank' rel='nofollow'>IDEOne it!</a>
 
-At this scale, the difference is negligible. In fact, `fact-no-loop` is occasionally faster than `fact` due to the unpredictable nature of computer memory. However, on a larger scale, this kind of optimisation can make your code much, much quicker.
+At this scale, the difference is negligible. In fact, `fact-no-loop` is occasionally faster than `fact` due to the unpredictable nature of computer memory. However, on a larger scale, this kind of optimization can make your code much, much quicker.
 
 ### Nesting Recursion Within functions
 
 `fact-no-loop` works without `loop/recur` because the entire function is recursive. What if we wanted part of our function to use a recursive loop, and then the rest of it to do something non-recursive? We'd have to define two entirely separate functions. Using `loop/recur` lets us use a little anonymous function instead.
 
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-| [Let Bindings](//forum.freecodecamp.com/t/clojure-create-local-variables-with-let/18415) | [Table of Contents](//forum.freecodecamp.com/t/clojure-resources/18422) | To Be Added |
\ No newline at end of file
+| [Let Bindings](//forum.freecodecamp.com/t/clojure-create-local-variables-with-let/18415) | [Table of Contents](//forum.freecodecamp.com/t/clojure-resources/18422) | To Be Added |