diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index e94b0906..53dbce8c 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1575,6 +1575,7 @@ Scheme:
   color: "#1e4aec"
   primary_extension: .scm
   extensions:
+  - .sld
   - .sls
   - .ss
   interpreters:
diff --git a/samples/Scheme/basic.sld b/samples/Scheme/basic.sld
new file mode 100644
index 00000000..85dc75c6
--- /dev/null
+++ b/samples/Scheme/basic.sld
@@ -0,0 +1,7 @@
+(define-library (libs basic)
+    (export list2 x)
+    (begin
+        (define (list2 . objs)  objs)
+        (define x 'libs-basic)
+        (define not-exported 'should-not-be-exported)
+        ))