diff --git a/README.adoc b/README.adoc
index 132e6c29..2e1ab1b7 100644
--- a/README.adoc
+++ b/README.adoc
@@ -2165,6 +2165,12 @@ rescue StandardError => e
 end
 ----
 
+=== Standard Exceptions [[standard-exceptions]]
+
+Prefer the use of exceptions from the standard library over introducing new exception classes.
+
+== Files
+
 === Reading from a file [[file-read]]
 
 Use the convenience methods `File.read` or `File.binread` when only reading a file start to finish in a single operation.
@@ -2288,9 +2294,21 @@ end
 FileUtils.rm_f(path)
 ----
 
-=== Standard Exceptions [[standard-exceptions]]
+=== Null Devices [[null-devices]]
 
-Prefer the use of exceptions from the standard library over introducing new exception classes.
+Use the platform independent null device (`File::NULL`) rather than hardcoding a value (`/dev/null` on Unix-like OSes, `NUL` or `NUL:` on Windows).
+
+[source,ruby]
+----
+# bad - hardcoded devices are platform specific
+File.open("/dev/null", 'w') { ... }
+
+# bad - unnecessary ternary can be replaced with `File::NULL`
+File.open(Gem.win_platform? ? 'NUL' : '/dev/null', 'w') { ... }
+
+# good - platform independent
+File.open(File::NULL, 'w') { ... }
+----
 
 == Assignment & Comparison