diff --git a/identify/extensions.py b/identify/extensions.py
index 2d00a34..3d2da78 100644
--- a/identify/extensions.py
+++ b/identify/extensions.py
@@ -52,6 +52,10 @@
     'erb': {'text', 'erb'},
     'exe': {'binary'},
     'eyaml': {'text', 'yaml'},
+    'f03': {'text', 'fortran'},
+    'f08': {'text', 'fortran'},
+    'f90': {'text', 'fortran'},
+    'f95': {'text', 'fortran'},
     'feature': {'text', 'gherkin'},
     'fish': {'text', 'fish'},
     'fits': {'binary', 'fits'},