diff --git a/pkgs/development/ocaml-modules/calendar/default.nix b/pkgs/development/ocaml-modules/calendar/default.nix
index 0010508a215b..6af7ce250772 100644
--- a/pkgs/development/ocaml-modules/calendar/default.nix
+++ b/pkgs/development/ocaml-modules/calendar/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation {
 
   meta =  {
     homepage = https://forge.ocamlcore.org/projects/calendar/;
-    description = "An Objective Caml library managing dates and times.";
+    description = "An Objective Caml library managing dates and times";
     license = "LGPL";
     platforms = ocaml.meta.platforms;
     maintainers = [
diff --git a/pkgs/development/ocaml-modules/ocsigen-server/default.nix b/pkgs/development/ocaml-modules/ocsigen-server/default.nix
index 0e01b811b57c..c69bf92b614c 100644
--- a/pkgs/development/ocaml-modules/ocsigen-server/default.nix
+++ b/pkgs/development/ocaml-modules/ocsigen-server/default.nix
@@ -25,7 +25,10 @@ stdenv.mkDerivation {
 
   meta = {
     homepage = http://ocsigen.org/ocsigenserver/;
-    description = "Ocsigen Server is a full featured Web server. It implements most features of the HTTP protocol, and has a very powerful extension mechanism that make very easy to plug your own OCaml modules for generating pages.";
+    description = "A full featured Web server''
+    longDescription =''
+      A full featured Web server. It implements most features of the HTTP protocol, and has a very powerful extension mechanism that make very easy to plug your own OCaml modules for generating pages.
+      '';
     license = "LGPL"; # <- todo: check
     platforms = ocaml.meta.platforms;
     maintainers = [ stdenv.lib.maintainers.gal_bolle ];
diff --git a/pkgs/development/ocaml-modules/tyxml/default.nix b/pkgs/development/ocaml-modules/tyxml/default.nix
index 39cee4e32ce0..02ac7f381e51 100644
--- a/pkgs/development/ocaml-modules/tyxml/default.nix
+++ b/pkgs/development/ocaml-modules/tyxml/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation {
 
   meta = {
     homepage = http://ocsigen.org/tyxml/;
-    description = "Tyxml is a library that makes it almost impossible for your OCaml programs to generate wrong XML ouput, using static typing.";
+    description = "A library that makes it almost impossible for your OCaml programs to generate wrong XML ouput, using static typing";
     license = "LGPL";
     platforms = ocaml.meta.platforms;
     maintainers = [
@@ -27,4 +27,4 @@ stdenv.mkDerivation {
       ];
   };
 
-}
\ No newline at end of file
+}