diff --git a/inflect.go b/inflect.go
index 556135c..8238aea 100644
--- a/inflect.go
+++ b/inflect.go
@@ -10,6 +10,8 @@ func newBoilRuleset() *inflect.Ruleset {
 	rs := inflect.NewRuleset()
 	rs.AddPlural("s", "s")
 	rs.AddPlural("testis", "testes")
+	rs.AddPlural("formula", "formulas")
+	rs.AddPlural("tax", "taxes")
 	rs.AddPlural("axis", "axes")
 	rs.AddPlural("octopus", "octopi")
 	rs.AddPlural("virus", "viri")
@@ -29,7 +31,6 @@ func newBoilRuleset() *inflect.Ruleset {
 	rs.AddPlural("rf", "rves")
 	rs.AddPlural("afe", "aves")
 	rs.AddPlural("bfe", "bves")
-	rs.AddPlural("cfe", "cves")
 	rs.AddPlural("dfe", "dves")
 	rs.AddPlural("efe", "eves")
 	rs.AddPlural("gfe", "gves")
@@ -94,6 +95,7 @@ func newBoilRuleset() *inflect.Ruleset {
 	rs.AddSingular("s", "")
 	rs.AddSingular("ss", "ss")
 	rs.AddSingular("as", "as")
+	rs.AddSingular("a", "ae")
 	rs.AddSingular("us", "us")
 	rs.AddSingular("is", "is")
 	rs.AddSingular("schemas", "schema")