diff --git a/README.md b/README.md
index 9a85a0a..8250504 100644
--- a/README.md
+++ b/README.md
@@ -141,7 +141,7 @@ HTTPDirFS options:
         --user-agent        Set user agent string (default: "HTTPDirFS")
         --no-range-check    Disable the build-in check for the server's support
                             for HTTP range requests
-        --insecure_tls      Disable licurl TLS certificate verification by
+        --insecure-tls      Disable licurl TLS certificate verification by
                             setting CURLOPT_SSL_VERIFYHOST to 0
         --single-file-mode  Single file mode - rather than mounting a whole
                             directory, present a single file inside a virtual
diff --git a/src/main.c b/src/main.c
index 76aff8f..f59a56d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -365,7 +365,7 @@ HTTPDirFS options:\n\
         --user-agent        Set user agent string (default: \"HTTPDirFS\")\n\
         --no-range-check    Disable the build-in check for the server's support\n\
                             for HTTP range requests\n\
-        --insecure_tls      Disable licurl TLS certificate verification by\n\
+        --insecure-tls      Disable licurl TLS certificate verification by\n\
                             setting CURLOPT_SSL_VERIFYHOST to 0\n\
         --single-file-mode  Single file mode - rather than mounting a whole\n\
                             directory, present a single file inside a virtual\n\