diff --git a/README b/README
index f16a045c3..f5f964ec4 100644
--- a/README
+++ b/README
@@ -865,8 +865,8 @@ identifier. This identifier is based on the text of the header. To
 derive the identifier from the header text,
 
   - Remove all formatting, links, etc.
-  - Remove all punctuation, except dashes and hyphens.
-  - Replace all spaces, dashes, newlines, and hyphens with hyphens.
+  - Remove all punctuation, except underscores and hyphens.
+  - Replace all spaces and newlines with hyphens.
   - Convert all alphabetic characters to lowercase.
   - Remove everything up to the first letter (identifiers may
     not begin with a number or punctuation mark).