diff --git a/bits/40_harb.js b/bits/40_harb.js
index a823197..0892781 100644
--- a/bits/40_harb.js
+++ b/bits/40_harb.js
@@ -814,14 +814,16 @@ var PRN = (function() {
 	var guess_seps = {
 		/*::[*/0x2C/*::]*/: ',',
 		/*::[*/0x09/*::]*/: "\t",
-		/*::[*/0x3B/*::]*/: ';'
+		/*::[*/0x3B/*::]*/: ';',
+		/*::[*/0x7C/*::]*/: '|'
 	};
 
 	// CSV separator weights to be used in case of equal numbers
 	var guess_sep_weights = {
 		/*::[*/0x2C/*::]*/: 3,
 		/*::[*/0x09/*::]*/: 2,
-		/*::[*/0x3B/*::]*/: 1
+		/*::[*/0x3B/*::]*/: 1,
+		/*::[*/0x7C/*::]*/: 0
 	};
 
 	function guess_sep(str) {
diff --git a/docbits/80_parseopts.md b/docbits/80_parseopts.md
index 6f8af41..30d969f 100644
--- a/docbits/80_parseopts.md
+++ b/docbits/80_parseopts.md
@@ -107,14 +107,16 @@ Plain text format guessing follows the priority order:
 |:-------|:--------------------------------------------------------------------|
 | XML    | `<?xml` appears in the first 1024 characters                        |
 | HTML   | starts with `<` and HTML tags appear in the first 1024 characters * |
-| XML    | starts with `<`                                                     |
+| XML    | starts with `<` and the first tag is valid                          |
 | RTF    | starts with `{\rt`                                                  |
 | DSV    | starts with `/sep=.$/`, separator is the specified character        |
-| DSV    | more unquoted `";"` chars than `"\t"` or `","` in the first 1024    |
-| TSV    | more unquoted `"\t"` chars than `","` chars in the first 1024       |
+| DSV    | more unquoted `|` chars than `;` `\t`  `,` in the first 1024        |
+| DSV    | more unquoted `;` chars than `\t` or `,` in the first 1024          |
+| TSV    | more unquoted `\t` chars than `,` chars in the first 1024           |
 | CSV    | one of the first 1024 characters is a comma `","`                   |
 | ETH    | starts with `socialcalc:version:`                                   |
-| PRN    | (default)                                                           |
+| PRN    | `PRN` option is set to true                                         |
+| CSV    | (fallback)                                                          |
 
 - HTML tags include: `html`, `table`, `head`, `meta`, `script`, `style`, `div`