diff --git a/doc/release-notes/8261-geojson.md b/doc/release-notes/8261-geojson.md
new file mode 100644
index 00000000000..ad3b2380ed9
--- /dev/null
+++ b/doc/release-notes/8261-geojson.md
@@ -0,0 +1,3 @@
+.geojson files are now correctly identified as GeoJSON files rather than "unknown".
+
+A full re-index is needed to update the facets, as well as optionally running the "redetect file type" API on existing GeoJSON files.
diff --git a/src/main/java/propertyFiles/MimeTypeDetectionByFileExtension.properties b/src/main/java/propertyFiles/MimeTypeDetectionByFileExtension.properties
index 91191d2b588..177d6e194cd 100644
--- a/src/main/java/propertyFiles/MimeTypeDetectionByFileExtension.properties
+++ b/src/main/java/propertyFiles/MimeTypeDetectionByFileExtension.properties
@@ -4,6 +4,7 @@ dbf=application/dbf
 dcm=application/dicom
 docx=application/vnd.openxmlformats-officedocument.wordprocessingml.document
 emf=application/x-emf
+geojson=application/geo+json
 h5=application/x-h5
 hdf=application/x-hdf
 hdf5=application/x-hdf5
diff --git a/src/main/java/propertyFiles/MimeTypeDisplay.properties b/src/main/java/propertyFiles/MimeTypeDisplay.properties
index 614ecb9b12a..231435bf299 100644
--- a/src/main/java/propertyFiles/MimeTypeDisplay.properties
+++ b/src/main/java/propertyFiles/MimeTypeDisplay.properties
@@ -107,6 +107,7 @@ application/x-emf=Extended Metafile
 application/x-h5=Hierarchical Data Format
 application/x-hdf=Hierarchical Data Format
 application/x-hdf5=Hierarchical Data Format
+application/geo+json=GeoJSON
 application/json=JSON
 application/mathematica=Mathematica
 application/matlab-mat=MATLAB Data
diff --git a/src/main/java/propertyFiles/MimeTypeFacets.properties b/src/main/java/propertyFiles/MimeTypeFacets.properties
index 2f91ca042b4..12762bca26d 100644
--- a/src/main/java/propertyFiles/MimeTypeFacets.properties
+++ b/src/main/java/propertyFiles/MimeTypeFacets.properties
@@ -106,6 +106,7 @@ application/x-emf=Data
 application/x-h5=Data
 application/x-hdf=Data
 application/x-hdf5=Data
+application/geo+json=Data
 application/json=Data
 application/mathematica=Data
 application/matlab-mat=Data