diff --git a/_/__init__.py b/_/__init__.py
index 04ca7c9..519deec 100644
--- a/_/__init__.py
+++ b/_/__init__.py
@@ -3,6 +3,7 @@ import sys
 import imp
 
 def to_i(num, b):
+    """String to integer."""
     n = 0
     for d in num:
         if int(d) > b:
@@ -11,11 +12,13 @@ def to_i(num, b):
     return n
 
 def to_c(digit):
+    """Integer to char."""
     if digit < 10:
       return str(digit)
     return chr(ord('a') + digit - 10)
 
 def to_s(number, base):
+    """Integer to string."""
     if number < 0:
       return '-' + to_s(-number, base)
     (d, m) = divmod(number, base)
@@ -30,6 +33,7 @@ def chunks(li, n):
     return r
 
 def __script__(src):
+    """For a documentation, consult the README."""
     code = []
     src = [list(to_s(ord(c), 6).rjust(3, "0")) for c in src]
     src = [int(x, base=6)+1 for sub in src for x in sub]
@@ -48,6 +52,7 @@ def __py_script__(src):
     return "import _\n\n" + __script__(src)
 
 def to_be_exec(name):
+    """Decodes _ to a fragment."""
     global code
     global fragment
     code.extend(fragment)
@@ -58,6 +63,7 @@ def to_be_exec(name):
 code = []
 fragment = []
 def _():
+    """Decodes all fragments to code and executes it."""
     global code
     global fragment
     if not code and not fragment:
@@ -74,6 +80,7 @@ def _to_code(filename):
     _()
 
 def _install_importer():
+    """Installs the module finder."""
     sys.meta_path.insert(0, Finder())
 
 class Finder:
@@ -84,8 +91,11 @@ class Finder:
             filename = os.path.join(dirname, fullname)
             if os.path.exists(filename):
                 return UnderScoreLoader(filename)
+            else if os.path.exists(filename + ".py"):
+                return UnderScoreLoader(filename + ".py")
 
 class UnderScoreLoader:
+    """Custom module loader for _ files."""
     def __init__(self, filename):
         self.filename = filename