diff --git a/README.md b/README.md
index 53ed9ad7..9921cd90 100644
--- a/README.md
+++ b/README.md
@@ -343,6 +343,32 @@ Filename: test.txt
 * Note2 : Use `NON_ASCII_FONTS` to access all Non-ASCII fonts name list (new in `Version 4.4`)
 * Note3 : Use `ASCII_FONTS` to access all ASCII fonts name list (new in `Version 5.7`)
 
+### Line
+
+#### 1. lprint
+
+This function prints a grid (`length` by `height`) of any given character.
+```pycon
+>>> lprint(length=15, height=2, char="*")
+***************
+***************
+```
+
+* Note1: This feature has been added since `Version 6.4`
+* Note2: The default values are `length=15`, `height=1`, `char='#'`
+
+#### 2. line
+
+This function returns a grid (`length` by `height`) of any given character as `str` in normal mode and raise `artError` in exception.
+```pycon	
+>>> line(length=15, height=2, char="*")
+'***************\n***************'
+```
+
+* Note1: This feature has been added since `Version 6.4`
+* Note2: The default values are `length=15`, `height=1`, `char='#'`
+
+
 ### Decoration
 
 ⚠️ Some environments don't support all decorations
diff --git a/art/functions.py b/art/functions.py
index 34ad1713..154072b3 100644
--- a/art/functions.py
+++ b/art/functions.py
@@ -15,7 +15,7 @@
 from .params import DECORATION_TYPE_ERROR, TEXT_TYPE_ERROR, FONT_TYPE_ERROR, CHR_IGNORE_TYPE_ERROR, FILE_TYPE_ERROR
 from .params import PRINT_STATUS_TYPE_ERROR, OVERWRITE_TYPE_ERROR, SEP_TYPE_ERROR, SPACE_TYPE_ERROR
 from .params import DETAILED_RETURN_TYPE_ERROR, ART_TYPE_ERROR, NUMBER_TYPE_ERROR, ART_NAME_ERROR
-from .params import LENGTH_TYPE_ERROR, LENGTH_RANGE_ERROR, HEIGHT_TYPE_ERROR, HEIGHT_RANGE_ERROR, CHAR_TYPE_ERROR
+from .params import LINE_LENGTH_ERROR, LINE_HEIGHT_ERROR, CHAR_TYPE_ERROR
 from .errors import artError
 
 
@@ -272,18 +272,13 @@ def line(length=15, height=1, char='#'):
     :type char: str
     :return: generated grid as str
     """
-    if not isinstance(length, int):
-        raise artError(LENGTH_TYPE_ERROR)
-    if not isinstance(height, int):
-        raise artError(HEIGHT_TYPE_ERROR)
+    if not isinstance(length, int) or length < 1:
+        raise artError(LINE_LENGTH_ERROR)
+    if not isinstance(height, int) or height < 1:
+        raise artError(LINE_HEIGHT_ERROR)
     if not isinstance(char, str):
         raise artError(CHAR_TYPE_ERROR)
 
-    if length < 1:
-        raise artError(LENGTH_RANGE_ERROR)
-    if height < 1:
-        raise artError(HEIGHT_RANGE_ERROR)
-
     line_str = char * length
     return "\n".join([line_str] * height)
 
diff --git a/art/params.py b/art/params.py
index 9cf02f5b..d4a855f2 100644
--- a/art/params.py
+++ b/art/params.py
@@ -32,10 +32,8 @@
 FONT_ENVIRONMENT_WARNING = "[Warning] '{0}' font is not printable in this environment."
 FONT_OR_DECOR_ENVIRONMENT_WARNING = "[Warning] '{0}' font or '{1}' decoration is not printable in this environment."
 PACKAGE_LOAD_WARNING = "[Warning] There is a problem loading the package 'coverage'."
-HEIGHT_TYPE_ERROR = "The 'height' type must be int."
-HEIGHT_RANGE_ERROR = "The 'height' parameter should be >= 1."
-LENGTH_TYPE_ERROR = "The 'length' type must be int."
-LENGTH_RANGE_ERROR = "The 'length' parameter should be >= 1."
+LINE_LENGTH_ERROR = "The 'length' must be an int higher than 0."
+LINE_HEIGHT_ERROR = "The 'height' must be an int higher than 0."
 CHAR_TYPE_ERROR = "The 'char' type must be str."
 
 CLI_HELP = """
diff --git a/art/tests/test.py b/art/tests/test.py
index dc115f59..979e1dab 100644
--- a/art/tests/test.py
+++ b/art/tests/test.py
@@ -10,10 +10,24 @@
 >>> lprint(length=15, height=2, char="*")
 ***************
 ***************
+>>> lprint(length=0, height=1, char="#")
+The 'length' must be an int higher than 0.
 >>> line(length=10, height=1, char="#")
 '##########'
 >>> line(length=15, height=2, char="*")
 '***************\n***************'
+>>> line(length=0, height=1, char="#")
+Traceback (most recent call last):
+        ...
+art.art.artError: The 'length' must be an int higher than 0.
+>>> line(length=15, height='test', char="#")
+Traceback (most recent call last):
+        ...
+art.art.artError: The 'height' must be an int higher than 0.
+>>> line(length=15, height=2, char=4)
+Traceback (most recent call last):
+        ...
+art.art.artError: The 'char' type must be str.
 >>> tprint("\t\t2","block")
 <BLANKLINE>
  .----------------.