diff --git a/src/substitute.js b/src/substitute.js
index 584c5ef..b25583b 100644
--- a/src/substitute.js
+++ b/src/substitute.js
@@ -1,21 +1,22 @@
 import parse from './parse/index.js';
 
-const isEncoded = (serverVariable) => {
+const isEncoded = (serverVariableValue) => {
   try {
     return (
-      typeof serverVariable === 'string' && decodeURIComponent(serverVariable) !== serverVariable
+      typeof serverVariableValue === 'string' &&
+      decodeURIComponent(serverVariableValue) !== serverVariableValue
     );
   } catch {
     return false;
   }
 };
 
-export const encodeServerVariable = (serverVariable) => {
-  if (isEncoded(serverVariable)) {
-    return serverVariable;
+export const encodeServerVariable = (serverVariableValue) => {
+  if (isEncoded(serverVariableValue)) {
+    return serverVariableValue;
   }
 
-  return encodeURIComponent(serverVariable).replace(/%5B/g, '[').replace(/%5D/g, ']');
+  return encodeURIComponent(serverVariableValue).replace(/%5B/g, '[').replace(/%5D/g, ']');
 };
 
 const significantTypes = ['literals', 'server-variable-name'];
diff --git a/src/test.js b/src/test.js
index b101787..1b27190 100644
--- a/src/test.js
+++ b/src/test.js
@@ -3,7 +3,7 @@ import parse from './parse/index.js';
 /**
  * Test if a string is a server URL template.
  *
- * @param {string} str
+ * @param {string} serverURLTemplate
  * @param {Object} [options={}] - An object.
  * @param {boolean} [options.strict=true] - A boolean indicating presence of at least one `Server Variable` AST node.
  * @returns {boolean}