diff --git a/README.md b/README.md
index a1dfa7b..e0aa96e 100644
--- a/README.md
+++ b/README.md
@@ -108,10 +108,10 @@ Indexing only requires an RDF file as input:
 tripsu index input.nt > index.nt
 ```
 
-Pseudonymization requires an RDF file, index and config as input:
+Pseudonymization requires an RDF file, index and rules configuration as input:
 
 ```shell
-tripsu pseudo --index index.nt --config rules.yaml input.nt > output.nt
+tripsu pseudo --index index.nt --rules rules.yaml input.nt > output.nt
 ```
 
 By default, pseudonymization uses a random key. To make the process
diff --git a/docs/tutorial.md b/docs/tutorial.md
index ab10218..607d7f2 100644
--- a/docs/tutorial.md
+++ b/docs/tutorial.md
@@ -8,7 +8,7 @@ on a large graph and we would like to pseudonymize some of the triples. This is
 how the flow should look like:
 
 ```shell
-curl <sparql-query> | tripsu pseudo -x index.nt -c config.yaml > pseudo.nt
+curl <sparql-query> | tripsu pseudo -x index.nt -r rules.yaml > pseudo.nt
 ```
 
 For this flow to stream data instead of loading everything into memory, note
diff --git a/src/io.rs b/src/io.rs
index d199248..a4d05b1 100644
--- a/src/io.rs
+++ b/src/io.rs
@@ -43,9 +43,9 @@ pub fn parse_ntriples(reader: impl BufRead) -> NTriplesParser<impl BufRead> {
 }
 
 // Parse yaml configuration file.
-pub fn parse_config(path: &Path) -> Rules {
+pub fn parse_rules(path: &Path) -> Rules {
     return match File::open(path) {
-        Ok(file) => serde_yml::from_reader(file).expect("Error parsing config file."),
+        Ok(file) => serde_yml::from_reader(file).expect("Error parsing rules file."),
         Err(e) => panic!("Cannot open file '{:?}': '{}'.", path, e),
     };
 }
@@ -62,7 +62,7 @@ pub fn read_bytes(path: &PathBuf) -> Vec<u8> {
 
 #[cfg(test)]
 mod tests {
-    use super::{parse_config, parse_ntriples};
+    use super::{parse_ntriples, parse_rules};
     use rio_api::parser::TriplesParser;
     use std::{
         io::{BufRead, BufReader},
@@ -86,8 +86,8 @@ mod tests {
     }
     // Test the parsing of a config file.
     #[test]
-    fn config_parsing() {
-        let config_path = Path::new("tests/data/config.yaml");
-        parse_config(&config_path);
+    fn rules_parsing() {
+        let config_path = Path::new("tests/data/rules.yaml");
+        parse_rules(&config_path);
     }
 }
diff --git a/src/main.rs b/src/main.rs
index d754fef..09cc481 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -51,10 +51,10 @@ struct PseudoArgs {
     #[arg(default_value = "-")]
     input: PathBuf,
 
-    /// The config file descriptor to use for defining RDF elements to pseudonymize.
+    /// File defining which RDF elements to pseudonymize.
     /// Format: yaml
     #[arg(short, long)]
-    config: PathBuf,
+    rules: PathBuf,
 
     /// Output file descriptor for pseudonymized triples.
     /// Defaults to `stdout`.
@@ -94,7 +94,7 @@ fn main() {
             pseudonymize_graph(
                 &log,
                 &args.input,
-                &args.config,
+                &args.rules,
                 &args.output,
                 &args.index,
                 &args.secret,
diff --git a/src/pseudo.rs b/src/pseudo.rs
index 1343885..6fbca0a 100644
--- a/src/pseudo.rs
+++ b/src/pseudo.rs
@@ -56,16 +56,16 @@ fn load_type_map(input: impl BufRead) -> HashMap<String, String> {
 pub fn pseudonymize_graph(
     _: &Logger,
     input: &Path,
-    config: &Path,
+    rules_path: &Path,
     output: &Path,
-    index: &Path,
+    index_path: &Path,
     secret_path: &Option<PathBuf>,
 ) {
     let buf_input = io::get_reader(input);
-    let buf_index = io::get_reader(index);
+    let buf_index = io::get_reader(index_path);
     let mut buf_output = io::get_writer(output);
 
-    let rules_config = io::parse_config(config);
+    let rules = io::parse_rules(rules_path);
     let node_to_type: HashMap<String, String> = load_type_map(buf_index);
 
     let secret = secret_path.as_ref().map(io::read_bytes);
@@ -79,7 +79,7 @@ pub fn pseudonymize_graph(
             .parse_step(&mut |t: TripleView| {
                 process_triple(
                     t.into(),
-                    &rules_config,
+                    &rules,
                     &node_to_type,
                     &mut buf_output,
                     &pseudonymizer,
@@ -107,14 +107,14 @@ mod tests {
 
         let dir = tempdir().unwrap();
         let input_path = Path::new("tests/data/test.nt");
-        let config_path = Path::new("tests/data/config.yaml");
+        let rules_path = Path::new("tests/data/rules.yaml");
         let output_path = dir.path().join("output.nt");
         let type_map_path = Path::new("tests/data/type_map.nt");
         let key = None;
         pseudonymize_graph(
             &logger,
             &input_path,
-            &config_path,
+            &rules_path,
             &output_path,
             &type_map_path,
             &key,
diff --git a/tests/data/config.yaml b/tests/data/rules.yaml
similarity index 100%
rename from tests/data/config.yaml
rename to tests/data/rules.yaml