diff --git a/README.md b/README.md
index d4bcb8a..33d8e58 100644
--- a/README.md
+++ b/README.md
@@ -989,7 +989,7 @@ str1>str2       # str1 is greater than str2
 -e file         # file exists; same -a
 -f file         # file exists and is a regular file (i.e., not a directory or other special type of file)
 -r file         # you have read permission
--r file         # file exists and is not empty
+-s file         # file exists and is not empty
 -w file         # your have write permission
 -x file         # you have execute permission on file, or directory search permission if it is a directory
 -N file         # file was modified since it was last read