diff -r 2713e42dcf4e -r ab798a37b846 mercurial/help.py
--- a/mercurial/help.py	Tue Jun 03 21:03:51 2008 +0200
+++ b/mercurial/help.py	Tue Jun 03 21:20:52 2008 +0200
@@ -161,4 +161,56 @@
     This is used by Python to find imported modules and may need to be set
     appropriately if Mercurial is not installed system-wide.
     '''),
+
+    ('revs|revisions|Specifying Single Revisions',
+    r'''
+    Mercurial accepts several notations for identifying individual
+    revisions.
+
+    A plain integer is treated as a revision number. Negative
+    integers are treated as offsets from the tip, with -1 denoting the
+    tip.
+
+    A 40-digit hexadecimal string is treated as a unique revision
+    identifier.
+
+    A hexadecimal string less than 40 characters long is treated as a
+    unique revision identifier, and referred to as a short-form
+    identifier. A short-form identifier is only valid if it is the
+    prefix of one full-length identifier.
+
+    Any other string is treated as a tag name, which is a symbolic
+    name associated with a revision identifier. Tag names may not
+    contain the ":" character.
+
+    The reserved name "tip" is a special tag that always identifies
+    the most recent revision.
+
+    The reserved name "null" indicates the null revision. This is the
+    revision of an empty repository, and the parent of revision 0.
+
+    The reserved name "." indicates the working directory parent. If
+    no working directory is checked out, it is equivalent to null.
+    If an uncommitted merge is in progress, "." is the revision of
+    the first parent.
+    '''),
+
+    ('mrevs|multirevs|Specifying Multiple Revisions',
+    r'''
+    When Mercurial accepts more than one revision, they may be
+    specified individually, or provided as a continuous range,
+    separated by the ":" character.
+
+    The syntax of range notation is [BEGIN]:[END], where BEGIN and END
+    are revision identifiers. Both BEGIN and END are optional. If
+    BEGIN is not specified, it defaults to revision number 0. If END
+    is not specified, it defaults to the tip. The range ":" thus
+    means "all revisions".
+
+    If BEGIN is greater than END, revisions are treated in reverse
+    order.
+
+    A range acts as a closed interval. This means that a range of 3:5
+    gives 3, 4 and 5. Similarly, a range of 4:2 gives 4, 3, and 2.
+    '''),
 )