diff --git a/src/utils.c b/src/utils.c
index b92c43c5a..2c26c114a 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -320,6 +320,7 @@ bool ExportDataAsCode(const unsigned char *data, int dataSize, const char *fileN
     {
         // Convert variable name to uppercase
         if ((varFileName[i] >= 'a') && (varFileName[i] <= 'z')) { varFileName[i] = varFileName[i] - 32; }
+        // Replace non valid character for C identifier with '_'
         else if (varFileName[i] == '.' || varFileName[i] == '-' || varFileName[i] == '?' || varFileName[i] == '!' || varFileName[i] == '+') { varFileName[i] = '_'; }
     }