diff --git a/Cargo.toml b/Cargo.toml
index b51d19a..67b662b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,5 @@ name = "minigraf"
 version = "0.1.0"
 edition = "2021"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
 graphql-parser = "0.4.0"
diff --git a/src/error_codes.rs b/src/error_codes.rs
new file mode 100644
index 0000000..3cc4cb2
--- /dev/null
+++ b/src/error_codes.rs
@@ -0,0 +1,2 @@
+pub const ERROR_INVALID_SCHEMA: i32 = 1;
+pub const ERROR_INVALID_QUERY: i32 = 2;
diff --git a/src/lib.rs b/src/lib.rs
index fc1e37e..e76e553 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,15 +1,12 @@
 use graphql_parser::query;
 use graphql_parser::schema;
 
-pub mod error_codes {
-    pub const ERROR_SCHEMA_INVALID: i32 = 1;
-    pub const ERROR_QUERY_INVALID: i32 = 2;
-}
+pub mod error_codes;
 
 pub fn load_schema(schema: &str) -> schema::Document<String> {
     let schema = schema::parse_schema::<String>(schema).unwrap_or_else(|err| {
         eprintln!("Error parsing schema: {}", err);
-        std::process::exit(error_codes::ERROR_SCHEMA_INVALID);
+        std::process::exit(error_codes::ERROR_INVALID_SCHEMA);
     });
     dbg!("schema: {:#?}", &schema);
 
@@ -19,7 +16,7 @@ pub fn load_schema(schema: &str) -> schema::Document<String> {
 pub fn parse_query(query: &str) -> query::Document<String> {
     let query = query::parse_query::<String>(query).unwrap_or_else(|err| {
         eprintln!("Error parsing query: {}", err);
-        std::process::exit(error_codes::ERROR_QUERY_INVALID);
+        std::process::exit(error_codes::ERROR_INVALID_QUERY);
     });
     dbg!("query: {:#?}", &query);
 
diff --git a/src/main.rs b/src/main.rs
index b35e807..88800ce 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,12 +9,12 @@ fn main() {
     // Read the schema file and parse it into a schema object.
     let schema_file = fs::read_to_string(schema_file).unwrap_or_else(|err| {
         eprintln!("Error reading schema file: {}", err);
-        process::exit(error_codes::ERROR_SCHEMA_FILE_INVALID);
+        process::exit(error_codes::ERROR_INVALID_SCHEMA_FILE);
     });
 
     minigraf::load_schema(&schema_file);
 }
 
 mod error_codes {
-    pub const ERROR_SCHEMA_FILE_INVALID: i32 = 0x100;
+    pub const ERROR_INVALID_SCHEMA_FILE: i32 = -1;
 }