diff --git a/PyTeX/build/build/builder.py b/PyTeX/build/build/builder.py
index 64a13d8..206093a 100644
--- a/PyTeX/build/build/builder.py
+++ b/PyTeX/build/build/builder.py
@@ -9,7 +9,7 @@ class PyTeXBuilder:
             self,
             build_dir_spec: BuildDirSpecification
     ):
-        self._build_spec: BuildDirSpecification = None
+        self._build_spec: BuildDirSpecification = build_dir_spec
 
         self._default_formatting_config: Optional[FormattingConfig] = None
 
@@ -17,4 +17,13 @@ class PyTeXBuilder:
         self._overwrite_existing_files: bool = False
         self._clean_old_files: True
 
-        self._allow_dirty: bool = False
\ No newline at end of file
+        self._allow_dirty: bool = False
+
+    def build_sources(self):
+        pass
+
+    def build_documentation(self):
+        pass
+
+    def build_tex(self):
+        pass
\ No newline at end of file