diff --git a/README.md b/README.md
index 6c5c6f3c49075143017facda8820bce27730eb4b..fe1380fda923514086bff6fb3b67db7a917caaad 100644
--- a/README.md
+++ b/README.md
@@ -46,8 +46,8 @@ Application Options:
   -y, --dnscrypt-port=   Listening ports for DNSCrypt
   -c, --tls-crt=         Path to a file with the certificate chain
   -k, --tls-key=         Path to a file with the private key
-      --tls-min-version= Minimum TLS version
-      --tls-max-version= Maximum TLS version
+      --tls-min-version= Minimum TLS version, for example 1.0
+      --tls-max-version= Maximum TLS version, for example 1.3
       --insecure         Disable secure TLS certificate validation
   -g, --dnscrypt-config= Path to a file with DNSCrypt configuration. You can generate one using https://github.com/ameshkov/dnscrypt
   -u, --upstream=        An upstream to be used (can be specified multiple times)
diff --git a/main.go b/main.go
index 62e023e4f24e44b75bdd2c33fb9e572d6386c331..5d281cc3316acbda54ac80707064b657e248c17d 100644
--- a/main.go
+++ b/main.go
@@ -60,10 +60,10 @@ type Options struct {
 	TLSKeyPath string `short:"k" long:"tls-key" description:"Path to a file with the private key"`
 
 	// Minimum TLS version
-	TLSMinVersion float32 `long:"tls-min-version" description:"Minimum TLS version" optional:"yes"`
+	TLSMinVersion float32 `long:"tls-min-version" description:"Minimum TLS version, for example 1.0" optional:"yes"`
 
 	// Minimum TLS version
-	TLSMaxVersion float32 `long:"tls-max-version" description:"Maximum TLS version" optional:"yes"`
+	TLSMaxVersion float32 `long:"tls-max-version" description:"Maximum TLS version, for example 1.3" optional:"yes"`
 
 	// Disable TLS certificate verification
 	Insecure bool `long:"insecure" description:"Disable secure TLS certificate validation" optional:"yes" optional-value:"false"`