diff --git a/README.md b/README.md
index 53f3f17..55a10e2 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ MENG Haowei, https://github.com/menghaowei/ngstools
 ```
 
 ## R Function: plot.matrix()
-please download `ngs_R_function.R`, `./test_data/hic-chr_1_100000.matrix.txt"` and you can use those R functions directly with `source` command in R envirnment like:
+please download `ngs_R_function.R`, `./test_data/hic-chr_1_100000.matrix.txt"` and you can use those R functions directly with `source` command in R environment like:
 
 ```
 # load R funtions
@@ -78,7 +78,7 @@ title(main="support rgb color format")
 
 - - - - - - - - - -
 ## R Function: plot.TAD()
-please download `ngs_R_function.R`, `./test_data/hic-chr_1_100000.matrix.txt"` and you can use those R functions directly with `source` command in R envirnment like:
+please download `ngs_R_function.R`, `./test_data/hic-chr_1_100000.matrix.txt"` and you can use those R functions directly with `source` command in R environment like:
 
 ```
 # load R funtions