diff --git a/Substring.md b/Substring.md
index b9e62f7..14867f8 100644
--- a/Substring.md
+++ b/Substring.md
@@ -1,7 +1,31 @@
 # Keyword `SUBSTRING`
 
 AlaSQL supports ```SUBSTRING(string, start, length)``` function:
+
+```string```: The string you want to slice.
+
+```start```: Where the substring should start. Positive value counts from left. First character is ```1```. Zero and negative values count from right where ```0``` is the last character.
+
+```length```: How many characters shall the substring have. If ```length``` is left out or larger than the rest of the ```string```, then ```SUBSTRING``` returns all remaining characters.
+
+## Examples
+
 ```sql
-    SELECT SUBSTRING('abc',1)
+    SELECT SUBSTRING('abcd',1)
+    -- returns 'abcd'
+    SELECT SUBSTRING('abcd',3)
+    -- returns 'cd'
+    SELECT SUBSTRING('abcd',1,2)
+    -- returns 'ab'
+    SELECT SUBSTRING('abcd',2,2)
     -- returns 'bc'
+    SELECT SUBSTRING('abcd',2,4)
+    -- returns 'bcd'
+    SELECT SUBSTRING('abcd',0) 
+    -- returns 'd'
+    SELECT SUBSTRING('abcd',-1)
+    -- returns 'cd'
+    SELECT SUBSTRING('abcd',-5,3)
+    -- returns 'abc'
 ```
+