diff --git a/reference/strings/functions/crypt.xml b/reference/strings/functions/crypt.xml
index 6e5876bcbb..b3f252d855 100644
--- a/reference/strings/functions/crypt.xml
+++ b/reference/strings/functions/crypt.xml
@@ -51,8 +51,10 @@
    </listitem>
    <listitem>
     <simpara>
-     <constant>CRYPT_EXT_DES</constant> - Extended DES-based encryption with a nine character salt
-     starting with "_", with the remainder coming from the alphabet "/0-9A-Za-z".
+     <constant>CRYPT_EXT_DES</constant> - Extended DES-based encryption. The "salt" is a 
+     9-character string consisting of an underscore followed by 4 bytes of iteration count and 4
+     bytes of salt. These are encoded as printable characters, 6 bits per character, least 
+     significant character first. The values 0 to 63 are encoded as "./0-9A-Za-z".
     </simpara>
    </listitem>
    <listitem>