diff --git a/boards/nucleo-l152re/doc.txt b/boards/nucleo-l152re/doc.txt
index 6f2a57deff..7ad20262a4 100644
--- a/boards/nucleo-l152re/doc.txt
+++ b/boards/nucleo-l152re/doc.txt
@@ -14,7 +14,7 @@ Cortex-M3 STM32L152RE microcontroller with 80KiB of RAM and 512KiB of Flash.
 
 ## Pinout
 
-@image html pinouts/nucleo-l152re.svg "Pinout for the nucleo-l152re" width=50%
+@image html pinouts/nucleo-l152re.svg "Pinout for the Nucleo-L152RE (from STM user manual UM1724, http://www.st.com/resource/en/user_manual/dm00105823.pdf, page 34)" width=50%
 
 ### MCU
 | MCU        | STM32L152RE       |