diff --git a/misc-scripts/xref_mapping/xref_config.ini b/misc-scripts/xref_mapping/xref_config.ini
index a64d7ee296bdecc18f203ce786f96fcc62f70d68..485aa8b64b88012d2d5cc6ad666cafe714c0cd2b 100644
--- a/misc-scripts/xref_mapping/xref_config.ini
+++ b/misc-scripts/xref_mapping/xref_config.ini
@@ -3,8 +3,15 @@
 ########################################################################
 # SOURCES                                                              #
 #                                                                      #
-# Keys: name, download, order, priority, prio_descr, parser,           #
-#       release_uri, data_uri (multiple)                               #
+# Keys:                                                                #
+#   name        - name of this source (required)                       #
+#   download    - must be downloaded (Y or N, required)                #
+#   order       - (required)                                           #
+#   priority    - (required)                                           #
+#   prio_descr  - (optional)                                           #
+#   parser      - the parser to be used (required)                     #
+#   release_uri - URI pointing to release information (optional)       #
+#   data_uri    - URI porinting to the data files (multiple, required) #
 #                                                                      #
 ########################################################################
 
@@ -1476,7 +1483,12 @@ data_uri        = mysql://ensembldb.ensembl.org::caenorhabditis_elegans_core_39_
 ########################################################################
 # SPECIES                                                              #
 #                                                                      #
-# Keys: taxonomy_id, aliases, source (multiple)                        #
+# Keys:                                                                #
+#   taxonomy_id - taxonomy ID of species/strain (required)             #
+#   strain_of   - species of which this is a strain (optional)         #
+#   aliases     - comma-separated list of aliases (optional)           #
+#   source      - sources use for this species/strain                  #
+#                 (multiple, required)                                 #
 #                                                                      #
 ########################################################################
 
@@ -1518,6 +1530,7 @@ source          = Uniprot/Varsplic::MULTI
 
 [species anopheles_gambiae_strain]
 taxonomy_id     = 180454
+strain_of       = anopheles_gambiae
 aliases         = agambiae_strain, anopheles_strain, anophelesgambiae_strain, mosquito_strain
 source          = ARRAY_EMBL_MMC1_20k_v1::anopheles_gambiae
 source          = ARRAY_EMBL_MMC2_12k_v1::anopheles_gambiae
@@ -1531,6 +1544,8 @@ source          = Celera_Trans::anopheles_gambiae
 source          = EntrezGene::MULTI
 source          = GO::MULTI
 source          = Interpro::MULTI
+source          = RefSeq_dna::MULTI-invertebrate
+source          = RefSeq_peptide::MULTI-invertebrate
 source          = UniGene::anopheles_gambiae
 source          = Uniprot/SPTREMBL::MULTI
 source          = Uniprot/SWISSPROT::MULTI
@@ -1569,6 +1584,7 @@ aliases         = caenorhabditiselegans, celegans, elegans
 source          = EntrezGene::MULTI
 source          = GO::caenorhabditis_elegans
 source          = Interpro::MULTI
+source          = RefSeq_dna::MULTI-invertebrate
 source          = RefSeq_peptide::MULTI-invertebrate
 source          = UniGene::caenorhabditis_elegans
 source          = Uniprot/SPTREMBL::MULTI