diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6518f8b8..13c6ac4f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,8 +7,9 @@
 - Add `similarity_measure` slot to the `MappingSet` class ([issue](https://github.com/mapping-commons/sssom/issues/411)).
 - Add `sssom_version` slot to the `MappingSet` class ([issue](https://github.com/mapping-commons/sssom/issues/439)).
 - Change the type of the `see_also` slot to `xsd:anyURI` ([issue](https://github.com/mapping-commons/sssom/issues/422)).
-- Add `mappings_set_confidence` slot to the `MappingSet` class ([issue](https://github.com/mapping-commons/sssom/issues/438)).
+- Add `mapping_set_confidence` slot to the `MappingSet` class ([issue](https://github.com/mapping-commons/sssom/issues/438)).
 - Updated the RDF binding of sssom:publication_date from dcterms:created to dcterms:issued, which is the more appropriate property to use in this case.
+- Add `mapping_tool_id` slot to the `Mapping` and `MappingSet` classes ([issue](https://github.com/mapping-commons/sssom/issues/449)).
 
 ## SSSOM version 1.0.0
 
diff --git a/examples/schema/mapping_tool_id.sssom.tsv b/examples/schema/mapping_tool_id.sssom.tsv
new file mode 100644
index 00000000..d14adc1c
--- /dev/null
+++ b/examples/schema/mapping_tool_id.sssom.tsv
@@ -0,0 +1,15 @@
+#curie_map:
+#  HP: http://purl.obolibrary.org/obo/HP_
+#  MP: http://purl.obolibrary.org/obo/MP_
+#  orcid: https://orcid.org/
+#  wikidata: https://www.wikidata.org/wiki/
+#mapping_set_id: https://w3id.org/sssom/commons/examples/mapping_tool_id.sssom.tsv
+#license: "https://creativecommons.org/publicdomain/zero/1.0/"
+#creator_id:
+#  - orcid:0000-0002-7356-1779
+#mapping_provider: "https://w3id.org/sssom/core_team"
+#issue_tracker: "https://github.com/mapping-commons/mh_mapping_initiative/issues"
+#comment: This is an example file for the SSSOM for illustration only. Its contents are entirely fabricated.
+subject_id	predicate_id	object_id	mapping_justification	mapping_tool_id
+HP:0009124	skos:exactMatch	MP:0000003	semapv:ManualMappingCuration	wikidata:Q58057366
+HP:0008551	skos:exactMatch	MP:0000018	semapv:ManualMappingCuration	wikidata:Q58057366
diff --git a/src/sssom_schema/schema/sssom_schema.yaml b/src/sssom_schema/schema/sssom_schema.yaml
index ee863867..428a2e40 100644
--- a/src/sssom_schema/schema/sssom_schema.yaml
+++ b/src/sssom_schema/schema/sssom_schema.yaml
@@ -548,6 +548,7 @@ slots:
   mapping_tool:
     description: A reference to the tool or algorithm that was used to generate the
       mapping. Should be a URL pointing to more info about it, but can be free text.
+      Consider using the mapping_tool_id slot for a more standardised reference.
     range: string
     instantiates: sssom:Propagatable
     annotations:
@@ -557,6 +558,22 @@ slots:
         description: A URL pointing to the AgreementMakerLight project.
       - value: AgreementMakerLight
         description: A string (name) denoting the AgreementMakerLight project.
+  mapping_tool_id:
+    description: The ID (entity reference) of the tool or algorithm that was used to generate the
+      mapping.
+    range: EntityReference
+    instantiates:
+      - sssom:Propagatable
+      - sssom:Versionable
+    annotations:
+      propagated: true
+      added_in: "1.1"
+    examples:
+      - value: wikidata:Q58057366
+        description: A wikidata PURL identifying the AgreementMakerLight project.
+    see_also:
+      - https://github.com/mapping-commons/sssom/blob/master/examples/schema/mapping_tool_id.sssom.tsv
+      - https://github.com/mapping-commons/sssom/issues/449
   mapping_tool_version:
     description: Version string that denotes the version of the mapping tool used.
     range: string
@@ -807,6 +824,7 @@ classes:
     - predicate_type
     - mapping_provider
     - mapping_tool
+    - mapping_tool_id
     - mapping_tool_version
     - mapping_date
     - publication_date
@@ -851,6 +869,7 @@ classes:
     - mapping_source
     - mapping_cardinality
     - mapping_tool
+    - mapping_tool_id
     - mapping_tool_version
     - mapping_date
     - publication_date