Update look peg special docs

janet-lang · Jun 18, 2024 · af72263 · af72263
1 parent 5ce08d9
commit af72263
Showing 1 changed file with 8 additions and 7 deletions.
diff --git a/content/docs/peg.mdz b/content/docs/peg.mdz
@@ -178,13 +178,14 @@ compiled to bytecode).
     @tr{@td{@code`(! patt)` }
     @td{ Alias for @code`(not patt)` }}
 
-    @tr{@td{@code`(look offset patt)` }
-        @td{ Matches only if patt matches at a fixed offset. offset can be any
-        integer. patt will not produce captures and the peg will not advance any
-        characters. }}
-
-    @tr{@td{@code`(> offset patt)` }
-        @td{ Alias for @code`(look offset patt)` }}
+    @tr{@td{@code`(look offset ?patt)` }
+        @td{ If patt is provided, matches only if patt matches at a fixed
+        offset. offset can be any integer. patt will not produce captures and
+        the peg will not advance any characters. If patt is not provided,
+        offset will be used as a value for patt. }}
+
+    @tr{@td{@code`(> offset ?patt)` }
+        @td{ Alias for @code`(look offset ?patt)` }}
 
     @tr{@td{@code`(to patt)` }
         @td{ Match up to patt (but not including it). If the end of the input