diff --git a/lib/src/finnish/frequency/particles.txt b/lib/src/finnish/frequency/particles.txt
index 7dc8ae515..e47724b84 100644
--- a/lib/src/finnish/frequency/particles.txt
+++ b/lib/src/finnish/frequency/particles.txt
@@ -1,10 +1,28 @@
+On the syntax of clitic particles in Finnish
+
 -- AR 29/12/2010
 
-Pas ::= pas | pa | han | kos | ko | kohan | pahan -- free
-Kin ::= kin/kaan                  -- dep. on polarity
+The clitic particles come in two groups:
+
+  Pas ::= pas | pa | han | kos | ko | kohan | pahan -- free variation
+  Kin ::= kin/kaan                                  -- depending on polarity
+
+(vowel harmony ignored). A Finnish sentence can have at most one of each. A Pas clitic is
+always attached to the first word ("Aripas juo maitoa") or phrase such as NP 
+("minun poikanipas juo maitoa"). A Kin clitic can be attached to almost any word; if the
+same as Pas, Kin must come first ("Arikinhan juo maitoa"). Some combinations are clumsy
+but presumably OK ("Arikinpas"). If the verb is first, it doesn't seem to allow Kin
+(*"juokin Ari maitoa"). 
+
+The following is a list of combinatory possibilities. Adverbs (represented by "nyt")
+can be added ad libitum - at most two of them then become carriers of clitics
+("nythän Ari juo maitoa täälläkin").
+
 
 -- declaratives and questions
 
+(Notice that, in the presence of "ei", Kin is "kaan", otherwise "kin".)
+
 ari    Pas? ei? (juo Kin maitoa nyt | juo maitoa Kin nyt | juo maitoa nyt Kin?)
 maitoa Pas? ei? (ari Kin juo    nyt | ari juo    Kin nyt | ari juo    nyt Kin?)
 nyt    Pas? ei? (ari Kin juo maitoa | ari juo Kin maitoa | ari juo    maitoa Kin?)
@@ -19,14 +37,19 @@ ei     Pas? (ari Kin juo maitoa nyt | ari juo Kin maitoa nyt | ari juo maitoa Ki
 
 -- imperatives
 
+The question clitic is (for obvious semantic reasons) omitted from the Pas category:
+
+  Pas- ::= pa | pas | han | pahan 
+
 juo    Pas-? (ari Kin maitoa nyt | ari maitoa Kin nyt | ari maitoa nyt Kin?)
 älä    Pas-? (ari Kin juo maitoa nyt | ari juo Kin maitoa nyt | ari juo maitoa Kin nyt 
               | ari juo maitoa nyt Kin?)
 
-Pas- ::= pa | pas | han | pahan 
 
 -- negation word
 
-*enkään, *etkään, *eikään, ?emmekään, ?ettekään, ?eivätkään (quite some Google hits)
+Strangely enough, Kin seems to be getting accepted in plural (= two-syllabic) negations:
+
+  *enkään, *etkään, *eikään, ?emmekään, ?ettekään, ?eivätkään (quite some Google hits)