diff --git a/README.md b/README.md
index d7b04b6..108d299 100644
--- a/README.md
+++ b/README.md
@@ -82,7 +82,9 @@ This will look for files in the `app` and `resources` directories and will creat
 - [x] Blade support
 - [x] Support all WordPress translation functions
 - [x] POT file header is customizable
+- [ ] Read info from style.css
 - [ ] Option to select output type (POT or JSON)
+- [ ] JSON / JS support
 
 See the [open issues](https://github.com/freave/make-pot/issues) for a full list of proposed features (and known issues).
 
diff --git a/src/cli/index.ts b/src/cli/index.ts
index 5ac3ebf..0b197d5 100644
--- a/src/cli/index.ts
+++ b/src/cli/index.ts
@@ -10,7 +10,11 @@ const args = initArgs();
 export const makePot = async () => {
     console.log(c.black.bgGreen("Freave make-pot " + getVersion()));
 
-    const results: any[] = await walkDirectories(args.source);
+    let results: any[] = await walkDirectories(args.source);
+
+    results = results.filter((result) => {
+        return result !== undefined;
+    });
 
     if (results.length === 0) {
         console.log(c.red("No matches found."));
diff --git a/src/helpers/walkDirectories.ts b/src/helpers/walkDirectories.ts
index eaca8c7..b1c325c 100644
--- a/src/helpers/walkDirectories.ts
+++ b/src/helpers/walkDirectories.ts
@@ -1,5 +1,5 @@
 import {readdir} from "node:fs/promises";
-import {resolve} from "node:path";
+import {resolve, extname} from "node:path";
 import c from "ansi-colors";
 
 // https://stackoverflow.com/a/45130990/8678755
@@ -16,7 +16,12 @@ async function getFiles(dir: string): Promise<any> {
 
     const files = await Promise.all(dirents.map((dirent) => {
         const res = resolve(dir, dirent.name);
-        return dirent.isDirectory() ? getFiles(res) : res;
+
+        if (!dirent.isDirectory() && extname(res) === '.php') {
+            return res;
+        }
+
+        return dirent.isDirectory() ? getFiles(res) : undefined;
     }));
     return Array.prototype.concat(...files);
 }
diff --git a/test/nested/a-folder/test.txt b/test/nested/a-folder/test.txt
new file mode 100644
index 0000000..16b14f5
--- /dev/null
+++ b/test/nested/a-folder/test.txt
@@ -0,0 +1 @@
+test file