diff --git a/src/opm/parser/eclipse/share/keywords/900_OPM/P/POLYMW b/src/opm/parser/eclipse/share/keywords/900_OPM/P/POLYMW
new file mode 100644
index 000000000..871b86112
--- /dev/null
+++ b/src/opm/parser/eclipse/share/keywords/900_OPM/P/POLYMW
@@ -0,0 +1,4 @@
+{
+  "name" : "POLYMW",
+  "sections" : [ "RUNSPEC" ]
+}
diff --git a/src/opm/parser/eclipse/share/keywords/keyword_list.cmake b/src/opm/parser/eclipse/share/keywords/keyword_list.cmake
index 122cb42ba..0f3676634 100644
--- a/src/opm/parser/eclipse/share/keywords/keyword_list.cmake
+++ b/src/opm/parser/eclipse/share/keywords/keyword_list.cmake
@@ -432,5 +432,6 @@ set( keywords
      900_OPM/M/MINPVFIL
      900_OPM/O/OCOMPIDX
      900_OPM/O/OILDENT
+     900_OPM/P/POLYMW
      900_OPM/R/RHO
      900_OPM/T/TLPMIXPA)