diff --git a/README.md b/README.md
index 93edf4a81fa..52223ef097b 100644
--- a/README.md
+++ b/README.md
@@ -236,7 +236,7 @@ And, in your `main.rs` or `lib.rs`:
 ```
 
 ## Configuration
-Some lints can be configured in a `Clippy.toml` file. It contains basic `variable = value` mapping eg.
+Some lints can be configured in a `clippy.toml` file. It contains basic `variable = value` mapping eg.
 
 ```toml
 blacklisted-names = ["toto", "tata", "titi"]
diff --git a/src/lib.rs b/src/lib.rs
index d65294b56b8..f5a3598a1ba 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -114,12 +114,12 @@ mod reexport {
 pub fn plugin_registrar(reg: &mut Registry) {
     let conf = match utils::conf::conf_file(reg.args()) {
         Ok(file_name) => {
-            // if the user specified a file, it must exist, otherwise default to `Clippy.toml` but
+            // if the user specified a file, it must exist, otherwise default to `clippy.toml` but
             // do not require the file to exist
             let (ref file_name, must_exist) = if let Some(ref file_name) = file_name {
                 (&**file_name, true)
             } else {
-                ("Clippy.toml", false)
+                ("clippy.toml", false)
             };
 
             let (conf, errors) = utils::conf::read_conf(&file_name, must_exist);