diff --git a/README.md b/README.md
index 3b80706..1191edb 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Powershell script: pfSense Certificate Viewer
 Sometimes it happens in pfSense that certificates are created with
 duplicated SerialNumbers (for the same CAroot). If any of these certificates
 are revoked, and it's in use for openVPN, we will be surprised of having more
-revoked certs than the desired. This tool finds those duplicated SerialNumbe
+revoked certs than the desired. This tool finds those duplicated SerialNumbers
 into a non encrypted xml pfSense config backup.
 
 Last change 2017/07/21: New feature: Now it also shows the CRL(s) in which the cert appears.