diff --git a/vocab_files/attribute_concepts/aircraft-type.ttl b/vocab_files/attribute_concepts/aircraft-type.ttl
index f8263bfa2..a08ac9b0f 100644
--- a/vocab_files/attribute_concepts/aircraft-type.ttl
+++ b/vocab_files/attribute_concepts/aircraft-type.ttl
@@ -9,7 +9,7 @@ PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
     a skos:Concept ;
     dcterms:source "Peacock D, Bignall J, Cox B, O'Neill S, Sparrow B. (2023) Aerial Counts Module. In ‘Ecological Field Monitoring Protocols Manual using the Ecological Monitoring System Australia’. (Eds S O’Neill, K Irvine, A Tokmakoff, B Sparrow). TERN, Adelaide." ;
     rdfs:isDefinedBy <https://linked.data.gov.au/def/nrm> ;
-    skos:definition "Refers to the type of aircraft used for aerial fauna survey." ;
+    skos:definition "Refers to the type of aircraft used for aerial fauna survey, e.g. plane or helicopter." ;
     skos:prefLabel "aircraft type" ;
     schema:url "https://github.com/ternaustralia/dawe-rlp-vocabs/tree/main/vocab_files/attribute_concepts/aircraft-type.ttl"^^xsd:anyURI ;
     tern:hasCategoricalCollection <https://linked.data.gov.au/def/nrm/9b3e8f6c-1d3a-5e79-85ca-d6ba81e6e741> ;
diff --git a/vocab_files/attribute_concepts/fauna-sampling-equipment-description.ttl b/vocab_files/attribute_concepts/fauna-sampling-equipment-description.ttl
index e4246b70f..443d513fb 100644
--- a/vocab_files/attribute_concepts/fauna-sampling-equipment-description.ttl
+++ b/vocab_files/attribute_concepts/fauna-sampling-equipment-description.ttl
@@ -9,7 +9,7 @@ PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
     a skos:Concept ;
     dcterms:source "McCallum K, Bignall J, Cox B, O’Neill S, Sparrow B. (2023) Fauna Ground Counts Module. In ‘Ecological Field Monitoring Protocols Manual using the Ecological Monitoring System Australia’. (Eds S O’Neill, K Irvine, A Tokmakoff, B Sparrow). TERN, Adelaide." ;
     rdfs:isDefinedBy <https://linked.data.gov.au/def/nrm> ;
-    skos:definition "The equipment/s used for sampling/counting fauna during ground surveys." ;
+    skos:definition "An additional description of the equipment type selected for use during the survey. E.g. optics, bulb types, the use and colour of any filters on spotlights or torches." ;
     skos:prefLabel "fauna sampling equipment description" ;
     schema:url "https://github.com/ternaustralia/dawe-rlp-vocabs/tree/main/vocab_files/attribute_concepts/fauna-sampling-equipment-description.ttl"^^xsd:anyURI ;
     tern:valueType tern:Text ;
diff --git a/vocab_files/observable_property_concepts/host-species-name.ttl b/vocab_files/observable_property_concepts/host-species-name.ttl
index dabe97c90..5887f5017 100644
--- a/vocab_files/observable_property_concepts/host-species-name.ttl
+++ b/vocab_files/observable_property_concepts/host-species-name.ttl
@@ -8,7 +8,7 @@ PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
     a skos:Concept ;
     dcterms:source "Laws M, Bignall J, McCallum K, Cox B, Potter T, O’Neill S, Sparrow B. (2023) Floristics Module. In ‘Ecological Field Monitoring Protocols Manual using the Ecological Monitoring System Australia’. (Eds S O’Neill, K Irvine, A Tokmakoff, B Sparrow). TERN, Adelaide." ;
     rdfs:isDefinedBy <https://linked.data.gov.au/def/nrm> ;
-    skos:definition "Taxon name determined during the process of field observation." ;
+    skos:definition "Taxon name determined during the process of field observation for the taxon hosting an epiphyte, mistletoe or parisite." ;
     skos:prefLabel "host species name" ;
     schema:url "https://github.com/ternaustralia/dawe-rlp-vocabs/tree/main/vocab_files/observable_property_concepts/host-species-name.ttl"^^xsd:anyURI ;
 .
diff --git a/vocab_files/observable_property_concepts/soil-runoff.ttl b/vocab_files/observable_property_concepts/soil-runoff.ttl
index fc11dbb80..d42d5b208 100644
--- a/vocab_files/observable_property_concepts/soil-runoff.ttl
+++ b/vocab_files/observable_property_concepts/soil-runoff.ttl
@@ -8,7 +8,7 @@ PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
     a skos:Concept ;
     dcterms:source "Ecological Field Monitoring protocols - Soil module , draft v0.1, 30/11/2021" ;
     rdfs:isDefinedBy <https://linked.data.gov.au/def/nrm> ;
-    skos:definition "Runoff is the liquid water which drains from land. If not specified, \"runoff\" refers to the sum of surface runoff and subsurface drainage." ;
+    skos:definition "Steen C, Laws M, Finn L, Gellie N, O’Neill S, Sparrow B. (2023) Soil Module. In ‘Ecological Field Monitoring Protocols Manual using the Ecological Monitoring System Australia’. (Eds S O’Neill, K Irvine, A Tokmakoff, B Sparrow). TERN, Adelaide; http://anzsoil.org/def/au/asls/land-surface/Runoff" ;
     skos:prefLabel "soil runoff" ;
     schema:url "https://github.com/ternaustralia/dawe-rlp-vocabs/tree/main/vocab_files/observable_property_concepts/soil-runoff.ttl"^^xsd:anyURI ;
 .