diff --git a/README.md b/README.md
index 3730965..c13e914 100644
--- a/README.md
+++ b/README.md
@@ -151,7 +151,7 @@ $ git submodule add git@github.com:dhruvasagar/vim-table-mode.git bundle/table-m
     mode also provides 2 special functions `Sum` and `Average`. Both these
     functions take a range as input. A range can be of two forms :
 
-      - `r1,r2`: This represents cells in the current column from row `r1`
+      - `r1:r2`: This represents cells in the current column from row `r1`
         through `r2`. If `r2` is negative it represents `r2` rows above the
         current row (of the target cell).
 
diff --git a/doc/table-mode.txt b/doc/table-mode.txt
index a79f211..000e2bf 100644
--- a/doc/table-mode.txt
+++ b/doc/table-mode.txt
@@ -119,7 +119,7 @@ Formula Expressions :
 	special functions 'Sum' and 'Average'. Both these functions take a
 	range as input. A range can be of two forms :
 
-		'n,m': This represents cells in the current column from row
+		'n:m': This represents cells in the current column from row
 		'n' through 'm'. If 'm' is negative it represents 'm' row
 		above the current row (of the target cell).