diff --git a/ext/bio/cgranges/cgranges.c b/ext/bio/cgranges/cgranges.c
index 87580e8..903cda8 100644
--- a/ext/bio/cgranges/cgranges.c
+++ b/ext/bio/cgranges/cgranges.c
@@ -83,6 +83,13 @@ static cgranges_t *get_cgranges(VALUE self)
   return ptr;
 }
 
+/*
+ * Allocates memory for a CGRanges object.
+ * This is called by rb_define_alloc_func and is responsible for
+ * memory allocation only, not initialization.
+ * Raises NoMemoryError if memory allocation fails.
+ */
+
 static VALUE
 cgranges_allocate(VALUE klass)
 {
@@ -94,17 +101,21 @@ cgranges_allocate(VALUE klass)
     return Qnil;
   }
 
+  // Wrap the C struct in a Ruby object and link with garbage collection
   return TypedData_Wrap_Struct(klass, &cgranges_type, ptr);
 }
 
-/* Create a new cgranges object
- *
- * @return [Bio::CGRanges]
+/*
+ * Initializes the CGRanges object.
+ * Called after memory is allocated by the allocate function.
+ * This method sets instance variable @indexed to false.
+ * @return [Bio::CGRanges] self
  */
 
 static VALUE
 cgranges_init(VALUE self)
 {
+  // Retrieve the cgranges object
   cgranges_t *cr = DATA_PTR(self);
 
   if (!cr)
@@ -113,6 +124,7 @@ cgranges_init(VALUE self)
     return Qnil;
   }
 
+  // Set the @indexed instance variable to false
   rb_ivar_set(self, rb_intern("@indexed"), Qfalse);
 
   return self;