diff --git a/doc/Doc.md b/doc/Doc.md
index 82892ae..7f19e1a 100644
--- a/doc/Doc.md
+++ b/doc/Doc.md
@@ -76,7 +76,7 @@
 |`(find-val-in-list lst name)`|Returns tail od sublist which first element is name|`>>> (find-val-in-list '(("a" ("av" "avv")) ("b" "bv") (31 32 33) (41 42 43)) "b") => "bv" >>> `|List manipulation|
 |`(map ..)`|Returns list that is the result of executing lambda on its elements|`(map (lambda (x) (+ x 10)) '(1 2 3 4 5 6)) => (11 12 13 14 15 16)`|List manipulation|
 |`(filter lambda list)`|Returns list with elements for which passed lambda returns true|`(filter (lambda (x) (> x 2)) '(1 2 3 4 5)) => (3 4 5)`|List manipulation|
-|`(reduce lambda acumulator list)`|Reduces list|`>>> (reduce (lambda (x y) (+ (* x 10) y)) 0 '(1 2 3 4)) => 1234`|List manipulation|
+|`(reduce lambda acumulator list)`|Reduces list|`>>> (reduce (lambda (acc e) (+ (* acc 10) e)) 0 '(1 2 3 4)) => 1234`|List manipulation|
 |`(exit code)`|Exit the program with an integer code||System|
 |`(quit code)`|Same as (exit ..)||System|
 |`(print ..)`|Print one or several values separated by space and return the last one|`>>> (print "pi" "is" 3.14)\npi is 3.140000 => 3.140000`|IO|
diff --git a/tests/test.lsp b/tests/test.lsp
index 82f93ea..f54cd3e 100644
--- a/tests/test.lsp
+++ b/tests/test.lsp
@@ -47,6 +47,8 @@
 (ut::define-test "result of (member '(1 2 3) 3)" '(ut::assert-true (member '(1 2 3) 3)))
 (ut::define-test "result of (member '(1 2 3) 4)" '(ut::assert-false (member '(1 2 3) 4)))
 
+(ut::define-test "result of (reduce (lambda (acc e) (+ acc (string (+ \"<th>\" e \"</th>\")))) \"\" '(\"h1\" \"h2\" \"h3\"))" '(ut::assert-equal "<th>h1</th><th>h2</th><th>h3</th>" (reduce (lambda (acc e) (+ acc (string (+ "<th>" e "</th>")))) "" '("h1" "h2" "h3"))))
+
 (ut::define-test "result of (take '(1 2 3 4) 3)" '(ut::assert-equal '(1 2 3) (take '(1 2 3 4) 3)))
 
 (ut::define-test "result of (make-list 3)" '(ut::assert-equal '(nil nil nil) (make-list 3)))