diff --git a/docs/hardware/espgeigerhw.md b/docs/hardware/espgeigerhw.md
index ad92a43..d5a713c 100644
--- a/docs/hardware/espgeigerhw.md
+++ b/docs/hardware/espgeigerhw.md
@@ -92,9 +92,9 @@ ROBOTRON 70 013 | 163mm | 500V | 600 / 0.001667 | External connection
 
 ## Tube References
 
-- [https://andkom.github.io/gmcalc/]
-- [https://arduino-geiger-pcb.blogspot.com/2017/03/conversion-rates-for-soviet-made-geiger.html]
-- [https://www.uradmonitor.com/topic/hardware-conversion-factor/]
+- (https://andkom.github.io/gmcalc/)
+- (https://arduino-geiger-pcb.blogspot.com/2017/03/conversion-rates-for-soviet-made-geiger.html)
+- (https://www.uradmonitor.com/topic/hardware-conversion-factor/)
 
 ### Possibly Compatible
 {: .no_toc }