diff --git a/docs/Formula-Cookbook.md b/docs/Formula-Cookbook.md
index e82499dc1620ec4e211bfc5b64e277e21c1494e2..3c22509af6577425c0b37c8f275ba6792c309442 100644
--- a/docs/Formula-Cookbook.md
+++ b/docs/Formula-Cookbook.md
@@ -732,9 +732,9 @@ Homebrew provides two formula DSL methods for launchd plist files:
 
 Homebrew has multiple levels of environment variable filtering which affects variables available to formulae.
 
-Firstly, the overall environment in which Homebrew runs is filtered to avoid environment contamination breaking from-source builds (<https://github.com/Homebrew/brew/issues/932>).  In particular, this process filters all but the given whitelisted variables, but allows environment variables prefixed with `HOMEBREW_`. The specific implementation can be seen in [`bin/brew`](https://github.com/Homebrew/brew/blob/master/bin/brew).
+Firstly, the overall environment in which Homebrew runs is filtered to avoid environment contamination breaking from-source builds (<https://github.com/Homebrew/brew/issues/932>). In particular, this process filters all but the given whitelisted variables, but allows environment variables prefixed with `HOMEBREW_`. The specific implementation can be seen in [`bin/brew`](https://github.com/Homebrew/brew/blob/master/bin/brew).
 
-The second level of filtering removes sensitive environment variables (such as credentials like keys, passwords or tokens) to avoid malicious subprocesses obtaining them (<https://github.com/Homebrew/brew/pull/2524>).  This has the effect of preventing any such variables from reaching a formula's Ruby code as they are filtered before it is called.  The specific implementation can be seen in the [`ENV.clear_sensitive_environment!` method](https://github.com/Homebrew/brew/blob/master/Library/Homebrew/extend/ENV.rb).
+The second level of filtering removes sensitive environment variables (such as credentials like keys, passwords or tokens) to avoid malicious subprocesses obtaining them (<https://github.com/Homebrew/brew/pull/2524>). This has the effect of preventing any such variables from reaching a formula's Ruby code as they are filtered before it is called. The specific implementation can be seen in the [`ENV.clear_sensitive_environment!` method](https://github.com/Homebrew/brew/blob/master/Library/Homebrew/extend/ENV.rb).
 
 In summary, environment variables used by a formula need to conform to these filtering rules in order to be available.