diff --git a/bip-0039.mediawiki b/bip-0039.mediawiki
index 2f60ad96..a04a745e 100644
--- a/bip-0039.mediawiki
+++ b/bip-0039.mediawiki
@@ -101,7 +101,7 @@ wordlists or even whole sentence generators, allowing for flexibility in wordlis
 for typo detection or other purposes.
 
 Although using mnemonic not generated by algorithm described in "Generating the
-mnemonic" section is possible, this is not advised and software should compute
+mnemonic" section is possible, this is not advised and software must compute
 checksum of the mnemonic sentence using wordlist and issue a warning if it is
 invalid.