diff --git a/src/c/libstl/stla_write.h b/src/c/libstl/stla_write.h
index 60e09b9..c8135af 100644
--- a/src/c/libstl/stla_write.h
+++ b/src/c/libstl/stla_write.h
@@ -10,10 +10,10 @@ typedef struct foug_stla_geom_output foug_stla_geom_output_t;
 struct foug_stla_geom_output
 {
   void* cookie;
-  size_t (*get_solid_count_func)(foug_stla_geom_output_t*);
-  void   (*get_solid_name)(foug_stla_geom_output_t*, size_t, char*);
+  size_t (*get_solid_count_func)   (foug_stla_geom_output_t*);
+  void   (*get_solid_name)         (foug_stla_geom_output_t*, size_t, char*);
   size_t (*get_triangle_count_func)(foug_stla_geom_output_t*, size_t);
-  void   (*get_triangle_func)(foug_stla_geom_output_t*, size_t, size_t, foug_stl_triangle_t*);
+  void   (*get_triangle_func)      (foug_stla_geom_output_t*, size_t, size_t, foug_stl_triangle_t*);
 };
 
 /* foug_stla_write() */
diff --git a/src/c/memory.h b/src/c/memory.h
index daf5921..4d99a7e 100644
--- a/src/c/memory.h
+++ b/src/c/memory.h
@@ -4,6 +4,6 @@
 #include <string.h>
 
 typedef void* (*foug_malloc_func_t)(size_t);
-typedef void (*foug_free_func_t)(void*);
+typedef void  (*foug_free_func_t)(void*);
 
 #endif /* FOUG_C_MEMORY_H */
diff --git a/src/c/stream.h b/src/c/stream.h
index d31451e..96a3345 100644
--- a/src/c/stream.h
+++ b/src/c/stream.h
@@ -11,11 +11,13 @@ struct foug_stream
 {
   void* cookie;
   foug_bool_t (*at_end_func)(foug_stream_t*);
-  int32_t (*error_func)(foug_stream_t*);
-  size_t (*read_func)(foug_stream_t*, void*, size_t, size_t);
-  size_t (*write_func)(foug_stream_t*, const void*, size_t, size_t);
+  int32_t     (*error_func)(foug_stream_t*);
+  size_t      (*read_func)(foug_stream_t*, void*, size_t, size_t);
+  size_t      (*write_func)(foug_stream_t*, const void*, size_t, size_t);
 };
 
+/* Initialization */
+
 FOUG_LIB_EXPORT void foug_stream_set_null(foug_stream_t* stream);
 FOUG_LIB_EXPORT void foug_stream_set_stdio(foug_stream_t* stream, FILE* file);