Fixing typo

README.md

@@ -83,7 +83,7 @@ Grids only have one important method: `Grid:getFrames(...)`.
 `Grid:getFrames` accepts an arbitrary number of parameters. They can be either numbers or strings.
 
 * Each two numbers are interpreted as quad coordinates in the format `(column, row)`. This way, `grid:getFrames(3,4)` will return the frame in column 3, row 4 of the grid. There can be more than just two: `grid:getFrames(1,1, 1,2, 1,3)` will return the frames in {1,1}, {1,2} and {1,3} respectively.
-* Using numbers for long rows or columns is tedious - so grids also accept strings indicating range plus a row/column index. Diferentiating rows and columns is based on the order in which the range and index are provided. A row can be fetch by calling `grid:getFrames('range', rowNumber)` and a column by calling `grid:getFrames(columnNumber, 'range'). The previous column of 3 elements, for example, can be also expressed like this: `grid:getFrames(1,'1-3')`. Again, there can be more than one string-index pair (`grid:getFrames(1,'1-3', '2-4',3)`)
+* Using numbers for long rows or columns is tedious - so grids also accept strings indicating range plus a row/column index. Diferentiating rows and columns is based on the order in which the range and index are provided. A row can be fetch by calling `grid:getFrames('range', rowNumber)` and a column by calling `grid:getFrames(columnNumber, 'range')`. The previous column of 3 elements, for example, can be also expressed like this: `grid:getFrames(1,'1-3')`. Again, there can be more than one string-index pair (`grid:getFrames(1,'1-3', '2-4',3)`)
 * It's also possible to combine both formats. For example: `grid:getFrames(1,4, 1,'1-3')` will get the frame in {1,4} plus the frames 1 to 3 in column 1
 
 But you will probably never use getFrames directly. You can use a grid as if it was a function, and getFrames will be called. In other words, given a grid called `g`, this: