diff --git a/filter/filter.c b/filter/filter.c
index 232a2d2c..776ad556 100644
--- a/filter/filter.c
+++ b/filter/filter.c
@@ -283,7 +283,8 @@ interpret(struct f_inst *what)
     TWOARGS_C;
     switch (res.type = v1.type) {
     case T_VOID: runtime( "Can not operate with values of type void" );
-    case T_INT: res.val.i = v1.val.i / v2.val.i; break;
+    case T_INT: if (v2.val.i == 0) runtime( "Mother told me not to divide by 0" );
+      	        res.val.i = v1.val.i / v2.val.i; break;
     case T_IP: if (v2.type != T_INT)
                  runtime( "Operator / is <ip>/<int>" );
                break;
diff --git a/filter/test.conf b/filter/test.conf
index c1d5977d..1b635cb7 100644
--- a/filter/test.conf
+++ b/filter/test.conf
@@ -1,5 +1,6 @@
 /*
  *	This is an example configuration file.
+ *	FIXME: add all examples from docs here.
  */
 
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