diff --git a/src/somali/QuestionSom.gf b/src/somali/QuestionSom.gf
index 073f1846..410038c8 100644
--- a/src/somali/QuestionSom.gf
+++ b/src/somali/QuestionSom.gf
@@ -46,6 +46,10 @@ concrete QuestionSom of Question = CatSom ** open
                                              True => [] ; _ => "baa"}
                                         ++ sbj.pron ++ sbj.noun ;
                                 -- TODO how do negative questions work
+                                -- Information questions are not commonly used in negative forms. When they occur they have the same forms as negative declaratives with focus (7.4.1). There is however a strong tendency to use positive forms, for example by subordinating the clause under a verb with an inherently negative meaning:
+                                -- Maxaad       u   tegi   weydey?
+                                -- what+FOC+you for go:INF failed
+                                -- 'Why didn't you go?' (lit. 'Why did you fail to go?')
                                 _ => case iadv.contractSTM of {
                                       True => [] ; _ => clRaw.stm ! Question ! p}
                                   ++ sbj.pron ++ sbj.noun } ;
diff --git a/src/somali/unittest/cl.gftest b/src/somali/unittest/cl.gftest
index 18c8e24d..6ea33be0 100644
--- a/src/somali/unittest/cl.gftest
+++ b/src/somali/unittest/cl.gftest
@@ -112,6 +112,11 @@ Lang: PhrUtt NoPConj (UttQS (UseQCl (TTAnt TPast ASimul) PPos (QuestIAdv where_I
 LangSom: maxaa aad u tagtay
 Lang: PhrUtt NoPConj (UttQS (UseQCl (TTAnt TPast ASimul) PPos (QuestIAdv why_IAdv (PredVP (UsePron youSg_Pron) (UseV go_V))))) NoVoc
 
+-- Negative question -- TODO not implemented yet properly. Saeed p. 203
+-- LangEng: why didn't you go
+LangSom: maxaa aad u tagi weydey
+Lang: PhrUtt NoPConj (UttQS (UseQCl (TTAnt TPast ASimul) PNeg (QuestIAdv why_IAdv (PredVP (UsePron youSg_Pron) (UseV go_V))))) NoVoc
+
 --- Longer example, unsure about word order -- TODO check
 -- LangEng: how does your mother paint the house black
 LangSom: sidee baa ay hooya BIND daa madow u rinjiyeysaa guri BIND ga