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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,5 +1,11 @@
 # gemini2html
+
 Fast Gemini to HTML converter written in C.
 
+## Requirements
+
+* GNU C99 or newer
+
 ## Resources Used
+
 https://gemini.circumlunar.space/docs/specification.html