diff --git a/src/c/global.h b/src/c/global.h
index 4860f6c..41da2b1 100644
--- a/src/c/global.h
+++ b/src/c/global.h
@@ -25,13 +25,13 @@
 #ifdef FOUG_HAVE_STDINT_H
 # include <stdint.h>
 #else
-typedef char int8_t;
+typedef char          int8_t;
 typedef unsigned char uint8_t;
 
-typedef short int16_t;
+typedef short          int16_t;
 typedef unsigned short uint16_t;
 
-typedef int int32_t;
+typedef int          int32_t;
 typedef unsigned int uint32_t;
 
 /*# ifdef _MSC_VER
@@ -45,7 +45,7 @@ typedef unsigned long long uint64_t;
 #endif /* FOUG_USE_STDINT_H */
 
 typedef int8_t foug_bool_t;
-typedef float foug_real32_t;
+typedef float  foug_real32_t;
 typedef double foug_real64_t;
 
 #endif /* FOUG_C_GLOBAL_H */
diff --git a/src/c/libstl/stla_read.h b/src/c/libstl/stla_read.h
index a093451..4aa36f0 100644
--- a/src/c/libstl/stla_read.h
+++ b/src/c/libstl/stla_read.h
@@ -10,10 +10,9 @@ typedef struct foug_stla_geom_input foug_stla_geom_input_t;
 struct foug_stla_geom_input
 {
   void* cookie;
-  void (*begin_solid_func)          (foug_stla_geom_input_t*, const char*);
+  void (*begin_solid_func)          (foug_stla_geom_input_t*, const char*); /* Optional */
   void (*process_next_triangle_func)(foug_stla_geom_input_t*, const foug_stl_triangle_t*);
-  void (*end_solid_func)            (foug_stla_geom_input_t*, const char*);
-  /* void (*parse_error_func)(foug_stla_geom_input_t*, size_t, size_t); */
+  void (*end_solid_func)            (foug_stla_geom_input_t*, const char*); /* Optional */
 };
 
 /* foug_stla_read() */