diff --git a/README.linux b/README.linux
index e851c5d98bfd779753ee1ec36303933980318d83..59d88950dfcce96535713738b9cd9b4b4c0ebf55 100644
--- a/README.linux
+++ b/README.linux
@@ -90,7 +90,9 @@ XMLDIR := /usr
 JNI := yes
 GEN_PDF := no
 
+Note: For Raspberry Pi "-fsigned-char" needs to be added to compiler flags in Makefile.personal:
 
+COMPILERFLAGS := -Wall -fsigned-char
 
 4. Run make