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-rw-r--r--book/en/src/preface.md5
1 files changed, 4 insertions, 1 deletions
diff --git a/book/en/src/preface.md b/book/en/src/preface.md
index 5cba633..50098c7 100644
--- a/book/en/src/preface.md
+++ b/book/en/src/preface.md
@@ -13,7 +13,10 @@ This book contains user level documentation for the Real-Time Interrupt-driven C
This is the documentation for RTIC v2.x.
Older releases:
-[RTIC v1.x](/1.0) | [RTIC v0.5.x (unsupported)](/0.5) | [RTFM v0.4.x (unsupported)](/0.4)
+[RTIC v1.x](/1) | [RTIC v0.5.x (unsupported)][v0_5] | [RTFM v0.4.x (unsupported)][v0_4]
+
+v0_5: https://github.com/rtic-rs/rtic/tree/release/v0.5
+v0_4: https://github.com/rtic-rs/rtic/tree/release/v0.4
{{#include ../../../README.md:7:12}}