diff --git a/pep-0508.txt b/pep-0508.txt
index 87bee98b7b4..381d497def7 100644
--- a/pep-0508.txt
+++ b/pep-0508.txt
@@ -85,7 +85,7 @@ included at the end of the PEP.
 Versions may be specified according to the PEP-440 [#pep440]_ rules. (Note:
 URI is defined in std-66 [#std66]_)::
 
-    version_cmp   = wsp* '<' | '<=' | '!=' | '==' | '>=' | '>' | '~=' | '==='
+    version_cmp   = wsp* '<=' | '<' | '!=' | '==' | '>=' | '>' | '~=' | '==='
     version       = wsp* ( letterOrDigit | '-' | '_' | '.' | '*' | '+' | '!' )+
     version_one   = version_cmp version wsp*
     version_many  = version_one (wsp* ',' version_one)*
@@ -355,48 +355,48 @@ Complete Grammar
 
 The complete parsley grammar::
 
-    wsp           = ' ' | '\t'
-    version_cmp   = wsp* <'<=' | '<' | '!=' | '==' | '>=' | '>' | '~=' | '==='>
-    version       = wsp* <( letterOrDigit | '-' | '_' | '.' | '*' | '+' | '!' )+>
-    version_one   = version_cmp:op version:v wsp* -> (op, v)
-    version_many  = version_one:v1 (wsp* ',' version_one)*:v2 -> [v1] + v2
-    versionspec   = ('(' version_many:v ')' ->v) | version_many
-    urlspec       = '@' wsp* <URI_reference>
-    marker_op     = version_cmp | (wsp* 'in') | (wsp* 'not' wsp+ 'in')
-    python_str_c  = (wsp | letter | digit | '(' | ')' | '.' | '{' | '}' |
-                     '-' | '_' | '*' | '#' | ':' | ';' | ',' | '/' | '?' |
-                     '[' | ']' | '!' | '~' | '`' | '@' | '$' | '%' | '^' |
-                     '&' | '=' | '+' | '|' | '<' | '>' )
-    dquote        = '"'
-    squote        = '\\''
-    python_str    = (squote <(python_str_c | dquote)*>:s squote |
-                     dquote <(python_str_c | squote)*>:s dquote) -> s
-    env_var       = ('python_version' | 'python_full_version' |
-                     'os_name' | 'sys_platform' | 'platform_release' |
-                     'platform_system' | 'platform_version' |
-                     'platform_machine' | 'platform_python_implementation' |
-                     'implementation_name' | 'implementation_version' |
-                     'extra' # ONLY when defined by a containing layer
-                     ):varname -> lookup(varname)
-    marker_var    = wsp* (env_var | python_str)
-    marker_expr   = marker_var:l marker_op:o marker_var:r -> (o, l, r)
-                  | wsp* '(' marker:m wsp* ')' -> m
-    marker_and    = marker_expr:l wsp* 'and' marker_expr:r -> ('and', l, r)
-                  | marker_expr:m -> m
-    marker_or     = marker_and:l wsp* 'or' marker_and:r -> ('or', l, r)
-                      | marker_and:m -> m
-    marker        = marker_or
-    quoted_marker = ';' wsp* marker
-    identifer_end = letterOrDigit | (('-' | '_' | '.' )* letterOrDigit)
-    identifier    = < letterOrDigit identifier_end* >
-    name          = identifier
-    extras_list   = identifier:i (wsp* ',' wsp* identifier)*:ids -> [i] + ids
-    extras        = '[' wsp* extras_list?:e wsp* ']' -> e
-    name_req      = (name:n wsp* extras?:e wsp* versionspec?:v wsp* quoted_marker?:m
-                     -> (n, e or [], v or [], m))
-    url_req       = (name:n wsp* extras?:e wsp* urlspec:v (wsp+ | end) quoted_marker?:m
-                     -> (n, e or [], v, m))
-    specification = wsp* ( url_req | name_req ):s wsp* -> s
+    wsp            = ' ' | '\t'
+    version_cmp    = wsp* <'<=' | '<' | '!=' | '==' | '>=' | '>' | '~=' | '==='>
+    version        = wsp* <( letterOrDigit | '-' | '_' | '.' | '*' | '+' | '!' )+>
+    version_one    = version_cmp:op version:v wsp* -> (op, v)
+    version_many   = version_one:v1 (wsp* ',' version_one)*:v2 -> [v1] + v2
+    versionspec    = ('(' version_many:v ')' ->v) | version_many
+    urlspec        = '@' wsp* <URI_reference>
+    marker_op      = version_cmp | (wsp* 'in') | (wsp* 'not' wsp+ 'in')
+    python_str_c   = (wsp | letter | digit | '(' | ')' | '.' | '{' | '}' |
+                      '-' | '_' | '*' | '#' | ':' | ';' | ',' | '/' | '?' |
+                      '[' | ']' | '!' | '~' | '`' | '@' | '$' | '%' | '^' |
+                      '&' | '=' | '+' | '|' | '<' | '>' )
+    dquote         = '"'
+    squote         = '\\''
+    python_str     = (squote <(python_str_c | dquote)*>:s squote |
+                      dquote <(python_str_c | squote)*>:s dquote) -> s
+    env_var        = ('python_version' | 'python_full_version' |
+                      'os_name' | 'sys_platform' | 'platform_release' |
+                      'platform_system' | 'platform_version' |
+                      'platform_machine' | 'platform_python_implementation' |
+                      'implementation_name' | 'implementation_version' |
+                      'extra' # ONLY when defined by a containing layer
+                      ):varname -> lookup(varname)
+    marker_var     = wsp* (env_var | python_str)
+    marker_expr    = marker_var:l marker_op:o marker_var:r -> (o, l, r)
+                   | wsp* '(' marker:m wsp* ')' -> m
+    marker_and     = marker_expr:l wsp* 'and' marker_expr:r -> ('and', l, r)
+                   | marker_expr:m -> m
+    marker_or      = marker_and:l wsp* 'or' marker_and:r -> ('or', l, r)
+                       | marker_and:m -> m
+    marker         = marker_or
+    quoted_marker  = ';' wsp* marker
+    identifier_end = letterOrDigit | (('-' | '_' | '.' )* letterOrDigit)
+    identifier     = < letterOrDigit identifier_end* >
+    name           = identifier
+    extras_list    = identifier:i (wsp* ',' wsp* identifier)*:ids -> [i] + ids
+    extras         = '[' wsp* extras_list?:e wsp* ']' -> e
+    name_req       = (name:n wsp* extras?:e wsp* versionspec?:v wsp* quoted_marker?:m
+                      -> (n, e or [], v or [], m))
+    url_req        = (name:n wsp* extras?:e wsp* urlspec:v (wsp+ | end) quoted_marker?:m
+                      -> (n, e or [], v, m))
+    specification  = wsp* ( url_req | name_req ):s wsp* -> s
     # The result is a tuple - name, list-of-extras,
     # list-of-version-constraints-or-a-url, marker-ast or None