diff --git a/README b/README
index 901e1c56cf..5e2d4bc40d 100644
--- a/README
+++ b/README
@@ -967,8 +967,8 @@ shorturllength: Length of URL at which URLs in a message exceeding 140
 dupelimit: minimum time allowed for one person to say the same thing
            twice. Default 60s. Anything lower is considered a user
            or UI error.
-textlimit: default max size for texts in the site. Defaults to 140,
-           null means no limit. Can be fine-tuned for notices, messages,
+textlimit: default max size for texts in the site. Defaults to 140.
+           0 means no limit. Can be fine-tuned for notices, messages,
            profile bios and group descriptions.
 
 db
@@ -1272,8 +1272,8 @@ banned: an array of usernames and/or profile IDs of 'banned' profiles.
         The site will reject any notices by these users -- they will
         not be accepted at all. (Compare with blacklisted users above,
         whose posts just won't show up in the public stream.)
-biolimit: max character length of bio; null means to use the site
-          text limit default.
+biolimit: max character length of bio; 0 means no limit; null means to use
+          the site text limit default.
 
 newuser
 -------
@@ -1371,7 +1371,8 @@ Options for group functionality.
 maxaliases: maximum number of aliases a group can have. Default 3. Set
             to 0 or less to prevent aliases in a group.
 desclimit: maximum number of characters to allow in group descriptions.
-           null (default) means to use the site-wide text limits.
+           null (default) means to use the site-wide text limits. 0
+           means no limit.
 
 oohembed
 --------
@@ -1457,6 +1458,7 @@ Configuration options specific to notices.
 
 contentlimit: max length of the plain-text content of a notice.
               Default is null, meaning to use the site-wide text limit.
+              0 means no limit.
 
 message
 -------
@@ -1465,6 +1467,7 @@ Configuration options specific to messages.
 
 contentlimit: max length of the plain-text content of a message.
               Default is null, meaning to use the site-wide text limit.
+              0 means no limit.
 
 Plugins
 =======