diff --git a/security/advancedtls/crl.go b/security/advancedtls/crl.go
index 5b3f90127..3931c1ec6 100644
--- a/security/advancedtls/crl.go
+++ b/security/advancedtls/crl.go
@@ -40,7 +40,7 @@ import (
 var grpclogLogger = grpclog.Component("advancedtls")
 
 // Cache is an interface to cache CRL files.
-// The cache implemetation must be concurrency safe.
+// The cache implementation must be concurrency safe.
 // A fixed size lru cache from golang-lru is recommended.
 type Cache interface {
 	// Add adds a value to the cache.