diff --git a/filename-extension.scm b/filename-extension.scm
new file mode 100644
index 0000000..3b45392
--- /dev/null
+++ b/filename-extension.scm
@@ -0,0 +1,43 @@
+(id ".scm")
+(stands-for "Scheme")
+(description "Source code for any implementation or standard")
+
+(id ".sps")
+(stands-for "Scheme program source")
+(description "R6RS program")
+
+(id ".sls")
+(stands-for "Scheme library source")
+(description "R6RS (library ...) form")
+
+(id ".sld")
+(stands-for "Scheme library definition")
+(description "R7RS (define-library ...) form")
+
+(id ".rkt")
+(stands-for "Racket")
+(description "Racket source code with #lang at the top")
+
+(id ".scr")
+(stands-for "Scribe")
+(description "Text document written using Scheme Scribe")
+
+(id ".scrbl")
+(stands-for "Scribble")
+(description "Text document written using Scribble")
+
+(id ".ss")
+(stands-for "Scheme source")
+(description "Equivalent to .scm")
+
+(id ".sc")
+(stands-for "Scheme")
+(description "Equivalent to .scm [rare]")
+
+(id ".sch")
+(stands-for "Scheme")
+(description "Equivalent to .scm [rare]")
+
+(id ".sps7")
+(stands-for "Scheme program source")
+(description "R7RS program [rare]")
diff --git a/generate.scm b/generate.scm
index ac33b0d..bf243b6 100644
--- a/generate.scm
+++ b/generate.scm
@@ -221,6 +221,20 @@
     '("ID" "Description")
     (map the-usual (sort-by-id (group-file 'id "hash-bang-syntax.scm"))))))
 
+(define (filename-extension)
+  (registry
+   "Filename extension"
+   "filename-extension"
+   '(p)
+   (tabulate
+    '("Extension" "Stands for" "Description")
+    (map (lambda (entry)
+           (cons (assoc? 'class entry)
+                 `((code ,(assoc1 'id entry))
+                   ,(assoc1 'stands-for entry)
+                   ,(assoc1 'description entry))))
+         (group-file 'id "filename-extension.scm")))))
+
 (define (foreign-status-set)
   (registry
    "Foreign status sets"
@@ -298,6 +312,7 @@
       ,(character-name)
       ,(hash-syntax)
       ,(hash-bang-syntax)
+      ,(filename-extension)
       ,(foreign-status-set)
       ,(foreign-status-property)))))