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-rw-r--r--nixpkgs/doc/languages-frameworks/crystal.section.md2
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diff --git a/nixpkgs/doc/languages-frameworks/crystal.section.md b/nixpkgs/doc/languages-frameworks/crystal.section.md
index af0853dbf75b..74790132974a 100644
--- a/nixpkgs/doc/languages-frameworks/crystal.section.md
+++ b/nixpkgs/doc/languages-frameworks/crystal.section.md
@@ -1,4 +1,4 @@
-# Crystal
+# Crystal {#crystal}
 
 ## Building a Crystal package