diff --git a/README.md b/README.md
index 774c49c1d08a7e76f3341743f50bd910b91f5efa..435c6440a60c906f82efa6ed31e5ed805475e117 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,11 @@ chmod +x wGRR*
 ```
 
 ## Usage
+### Example
+```bash
+./wGRR -i example/test_0.prt -o TEST0
+```
+
 ### On a local machine
 ```bash
 ./wGRR -i $fasta [-p $mmseqs2_path -o $output_prefix -t $threads -a $comparisons -T -f]
diff --git a/wGRR b/wGRR
index 01e5f6844954a2a906ab91992cb663a88489eff7..0a9efd71161e33dde83418a7d86544b3a355444d 100755
--- a/wGRR
+++ b/wGRR
@@ -16,7 +16,7 @@ ALL_ARGS=($@)
 
 display_usage() {
 	echo "wGRR version ${VERSION}"
-	echo "${bold}USAGE:${normal} $ZSH_ARGZERO -f <fasta_file> [OPTIONS]"
+	echo "${bold}USAGE:${normal} $ZSH_ARGZERO -i <fasta_file> [OPTIONS]"
 	echo ""
 	echo "${bold}MANDATORY PARAMETERS:${normal}"
 	echo "   -i <string>       fasta file with all proteins of all the compared genetic elements."