diff --git a/README.md b/README.md
index 4bf4d4b..f642eef 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,7 @@ $ bip39-cli accounts --count 9 "dentist whale pattern drastic time black cigar b
   Options:
 
     -w, --wordlist <wordlist>  EN JA chinese_simplified chinese_traditional english french italian japanese korean spanish (default: english)
+    --strength <strength>      strength defaults to 128 (min), max is 256, must be a multiple of 32 (default: 128)
     -h, --help                 output usage information
 ```
 
diff --git a/generate.js b/generate.js
index adb024b..924ba16 100644
--- a/generate.js
+++ b/generate.js
@@ -13,9 +13,12 @@ program
     utils.validWordlists.join(" "),
     utils.defaultWordlist
   )
+  .option("--strength <strength>",
+          "strength defaults to 128 (min), max is 256, must be a multiple of 32",
+          128)
   .action(options => {
     const wordlist = utils.parseWordlistOption(options);
 
-    console.log(bip39.generateMnemonic(null, null, wordlist));
+    console.log(bip39.generateMnemonic(options.strength, null, wordlist));
     process.exit(0);
   });