diff --git a/src/utils/fluidsynth_priv.h b/src/utils/fluidsynth_priv.h
index b0e7b746..c9919d9a 100644
--- a/src/utils/fluidsynth_priv.h
+++ b/src/utils/fluidsynth_priv.h
@@ -256,6 +256,10 @@ do { strncpy(_dst,_src,_n); \
 #define FLUID_FPRINTF                fprintf
 
 #if (defined(WIN32) && _MSC_VER < 1900) || defined(MINGW32)
+    /* need to make sure we use a C99 compliant implementation of (v)snprintf(),
+     * i.e. not microsofts non compliant extension _snprintf() as it doesnt
+     * reliably null-terminates the buffer
+     */
     #define FLUID_SNPRINTF           g_snprintf
 #else
     #define FLUID_SNPRINTF           snprintf